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<!DOCTYPE html>
<html><head><meta charset="UTF-8" /><meta name="viewport" content="initial-scale=1.0" /><link rel="stylesheet" href="../help.css" /></head><body><ul id="top">
<li><a href="#qué-es-delta-chat">¿Qué es Delta Chat?</a>
<ul>
<li><a href="#cómo-puedo-encontrar-personas-con-las-que-chatear">¿Cómo puedo encontrar personas con las que chatear?</a></li>
<li><a href="#cuáles-son-las-ventajas-de-delta-chat-comparado-con-otras-aplicaciones-de-mensajería">¿Cuáles son las ventajas de Delta Chat comparado con otras aplicaciones de mensajería?</a></li>
<li><a href="#qué-mensajes-se-muestran-en-delta-chat">¿Qué mensajes se muestran en Delta Chat?</a></li>
<li><a href="#what-if-i-expect-a-message-from-someone-i-didnt-write-to-in-the-past">What if I expect a message from someone I didn’t write to in the past?</a></li>
<li><a href="#delta-chat-soporta-envío-de-imágenes-videos-documentos-y-otros-archivos">¿Delta Chat soporta envío de imágenes, videos, documentos y otros archivos?</a></li>
<li><a href="#multiple-accounts">How can I add or switch between multiple accounts?</a></li>
<li><a href="#quién-ve-mi-foto-de-perfil">¿Quién ve mi foto de perfil?</a></li>
<li><a href="#delta-chat-soporta-mensajes-con-formato-html">¿Delta Chat soporta mensajes con formato HTML?</a></li>
<li><a href="#por-qué-debo-ingresar-mi-contraseña-de-correo-electrónico-en-delta-chat-es-esto-seguro">¿Por qué debo ingresar mi contraseña de correo electrónico en Delta Chat? ¿Es esto seguro?</a></li>
<li><a href="#qué-permisos-necesita-delta-chat">¿Qué permisos necesita Delta Chat?</a></li>
<li><a href="#qué-significa-fijar-mutear-archivar">¿Qué significa fijar, mutear, archivar?</a></li>
<li><a href="#what-does-the-green-dot-mean">What does the green dot mean?</a></li>
<li><a href="#how-can-i-delete-my-account">How can I delete my account?</a></li>
</ul>
</li>
<li><a href="#grupos">Grupos</a>
<ul>
<li><a href="#creación-de-un-grupo">Creación de un grupo</a></li>
<li><a href="#agregar-miembros-a-un-grupo">Agregar miembros a un grupo</a></li>
<li><a href="#me-he-eliminado-por-accidente">Me he eliminado por accidente.</a></li>
<li><a href="#no-quiero-recibir-más-los-mensajes-de-un-grupo">No quiero recibir más los mensajes de un grupo.</a></li>
<li><a href="#qué-significan-las-marcas-que-se-muestran-junto-a-los-mensajes-salientes">¿Qué significan las marcas que se muestran junto a los mensajes salientes?</a></li>
<li><a href="#what-happens-if-i-turn-on-delete-old-messages-from-server">What happens if I turn on “Delete old messages from server”?</a></li>
<li><a href="#delold">What happens if I turn on “Delete old messages from device”?</a></li>
</ul>
</li>
<li><a href="#encryption-and-security">Encryption and Security</a>
<ul>
<li><a href="#which-standards-are-used-for-end-to-end-encryption">Which standards are used for end-to-end encryption?</a></li>
<li><a href="#whene2e">How can i know if messages are end-to-end encrypted?</a></li>
<li><a href="#howtoe2ee">How can I get guaranteed end-to-end encryption and green checkmarks?</a></li>
<li><a href="#e2eeguarantee">What does the green checkmark and “guaranteed end-to-end encryption” mean?</a></li>
<li><a href="#nocryptanymore">A contact “sent a message from another device”, what can i do?</a></li>
<li><a href="#are-attachments-pictures-files-audio-etc-end-to-end-encrypted">Are attachments (pictures, files, audio etc.) end-to-end encrypted?</a></li>
<li><a href="#openpgp-secure">Is OpenPGP secure?</a></li>
<li><a href="#openpgp-alternatives">Did you consider using alternatives to OpenPGP for end-to-end -encryption?</a></li>
<li><a href="#is-delta-chat-vulnerable-to-efail">Is Delta Chat vulnerable to EFAIL?</a></li>
<li><a href="#tls">Is a message exposed in cleartext if end-to-end encryption is not available?</a></li>
<li><a href="#message-metadata">How does Delta Chat protect metadata in messages?</a></li>
<li><a href="#device-seizure">How to protect metadata and contacts when a device is seized?</a></li>
<li><a href="#how-can-i-check-encryption-information">How can i check encryption information?</a></li>
<li><a href="#how-can-i-check-the-encryption-status-of-messages">How can I check the encryption status of messages?</a></li>
<li><a href="#why-do-i-see-unencrypted-messages">Why do I see unencrypted messages?</a></li>
<li><a href="#how-can-i-get-an-end-to-end-encrypted-chat-with-a-delta-chat-contact-who-sometimes-uses-webmail-or-another-non-autocrypt-e-mail-app">How can i get an end-to-end encrypted chat with a Delta Chat contact who sometimes uses webmail or another non-Autocrypt e-mail app?</a></li>
<li><a href="#how-can-i-ensure-message-end-to-end-encryption-and-deletion">How can I ensure message end-to-end encryption and deletion?</a></li>
<li><a href="#pfs">Does Delta Chat support Perfect Forward Secrecy?</a></li>
<li><a href="#is-end-to-end-encryption-of-delta-chat-as-safe-as-signal">Is end-to-end encryption of Delta Chat as safe as Signal?</a></li>
<li><a href="#puedo-reutilizar-mi-llave-privada-existente">¿Puedo reutilizar mi llave privada existente?</a></li>
<li><a href="#no-puedo-importar-mi-clave-pgp-existente-en-delta-chat">No puedo importar mi clave PGP existente en Delta Chat.</a></li>
</ul>
</li>
<li><a href="#multiclient">Múltiples dispositivos</a>
<ul>
<li><a href="#puedo-usar-delta-chat-en-varios-dispositivos-al-mismo-tiempo">¿Puedo usar Delta Chat en varios dispositivos al mismo tiempo?</a></li>
<li><a href="#troubleshooting">Troubleshooting</a></li>
<li><a href="#backup">Manual Transfer</a></li>
<li><a href="#tienen-planeado-crear-un-cliente-web-de-delta-chat">¿Tienen planeado crear un cliente web de Delta Chat?</a></li>
<li><a href="#para-qué-sirve-la-configuración-enviar-autocopia">¿Para qué sirve la configuración “Enviar autocopia”?</a></li>
<li><a href="#por-qué-puedo-elegir-monitorear-la-carpeta-enviados">¿Por qué puedo elegir monitorear la carpeta “Enviados”?</a></li>
<li><a href="#por-qué-puedo-elegir-no-monitorear-la-carpeta-deltachat">¿Por qué puedo elegir no monitorear la carpeta DeltaChat?</a></li>
</ul>
</li>
<li><a href="#webxdc">webxdc apps</a>
<ul>
<li><a href="#how-private-are-webxdc-apps">How private are webxdc apps?</a></li>
<li><a href="#where-can-i-get-webxdc-apps">Where can I get webxdc apps?</a></li>
<li><a href="#how-can-i-create-my-own-webxdc-apps">How can I create my own webxdc apps?</a></li>
</ul>
</li>
<li><a href="#experimental-features">Experimental Features</a>
<ul>
<li><a href="#how-can-i-use-audiovideo-calls-with-delta-chat">How can I use audio/video calls with Delta Chat?</a></li>
<li><a href="#what-are-broadcast-lists-and-how-can-i-use-them">What are Broadcast Lists and how can I use them?</a></li>
<li><a href="#how-can-i-share-my-location-with-my-chat-partners">How can I share my location with my chat partners?</a></li>
<li><a href="#what-does-the-experimental-database-encryption-actually-protect">What does the experimental database encryption actually protect?</a></li>
<li><a href="#why-can-i-choose-to-only-watch-the-deltachat-folder">Why can I choose to only watch the DeltaChat folder?</a></li>
<li><a href="#how-can-i-change-my-account-to-a-different-e-mail-address">How can I change my account to a different e-mail address?</a></li>
</ul>
</li>
<li><a href="#miscelaneo">Miscelaneo</a>
<ul>
<li><a href="#delta-chat-funciona-con-mi-proveedor-de-correo-electrónico">¿Delta Chat funciona con <em>mi</em> proveedor de correo electrónico?</a></li>
<li><a href="#i-want-to-manage-my-own-e-mail-server-for-delta-chat-what-do-you-recommend">I want to manage my own e-mail server for Delta Chat. What do you recommend?</a></li>
<li><a href="#si-delta-chat-utiliza-el-correo-electrónico-es-realmente-una-aplicación-de-mensajería-instantánea">Si Delta Chat utiliza el correo electrónico, ¿es realmente una aplicación de mensajería <em>instantánea</em>?</a></li>
<li><a href="#delta-chat-es-compatible-con-protonmail--tutanota--criptext">¿Delta Chat es compatible con Protonmail / Tutanota / Criptext?</a></li>
<li><a href="#estoy-interesado-en-los-detalles-técnicos-pueden-decirme-más">Estoy interesado en los detalles técnicos. ¿Pueden decirme más?</a></li>
<li><a href="#security-audits">Was Delta Chat independently audited for security vulnerabilities?</a></li>
<li><a href="#cómo-se-financia-el-desarrollo-de-delta-chat">¿Cómo se financia el desarrollo de Delta Chat?</a></li>
</ul>
</li>
</ul>
<h2 id="qué-es-delta-chat">
¿Qué es Delta Chat? <a href="#qué-es-delta-chat" class="anchor"></a>
</h2>
<p>Delta Chat es una nueva aplicación de chat que envía mensajes por correo electrónico, encriptados si es posible, con Autocrypt.
<strong>No tiene que registrarse en ningún lugar, solo use su cuenta de correo electrónico existente con Delta Chat.</strong></p>
<p><img style="float:right; width:50%; max-width:360%; margin:1em;" src="../delta-what-optim.png" /></p>
<h3 id="cómo-puedo-encontrar-personas-con-las-que-chatear">
¿Cómo puedo encontrar personas con las que chatear? <a href="#cómo-puedo-encontrar-personas-con-las-que-chatear" class="anchor"></a>
</h3>
<p>Con Delta Chat, puede escribir en cada dirección de correo electrónico existente - incluso
si el destinatario no está utilizando la aplicación Delta Chat. No es necesario que el
destinatario instale la misma aplicación que usted, como ocurre con otros mensajeros.</p>
<h3 id="cuáles-son-las-ventajas-de-delta-chat-comparado-con-otras-aplicaciones-de-mensajería">
¿Cuáles son las ventajas de Delta Chat comparado con otras aplicaciones de mensajería? <a href="#cuáles-son-las-ventajas-de-delta-chat-comparado-con-otras-aplicaciones-de-mensajería" class="anchor"></a>
</h3>
<ul>
<li><em>Independent</em> of any company or services. <em>You</em> own your data.</li>
<li>Your data is not saved on a central server unless all users are using
the same e-mail servers</li>
<li>You do not distribute your address book to anyone.</li>
<li><em>Fast</em> by the use of Push-IMAP.</li>
<li><em>Largest userbase</em> - recipients <em>not</em> using Delta Chat can be reached as well.</li>
<li><em>No Spam</em> - only messages of known users are shown by default.</li>
<li><em>End-to-end encryption</em> via Autocrypt.</li>
<li><em>Copyleft</em> and <em>Standards</em> based libre software.</li>
<li><em>Flexible identity</em> with built-in support for <a href="#multiple-accounts">multiple accounts</a></li>
</ul>
<h3 id="qué-mensajes-se-muestran-en-delta-chat">
¿Qué mensajes se muestran en Delta Chat? <a href="#qué-mensajes-se-muestran-en-delta-chat" class="anchor"></a>
</h3>
<p>By default, Delta Chat shows all e-mails.</p>
<p>At “Settings -&gt; Chats &amp;
Media -&gt; Show Classic E-Mails”, you can change this. You have these options:</p>
<ul>
<li>“No, chats only”: Only messages sent by other Delta Chat users and replies to
your Delta Chat messages are shown. This makes most sense if you use the same
e-mail account for normal e-mails as well.</li>
<li>“All”: Delta Chat shows all e-mails that are sent to your email address. This
makes sense if you want to use Delta Chat for all your e-mails, so no message
gets lost. This is the default setting.</li>
<li>“For accepted contacts”: Delta Chat shows all e-mails from contacts with whom
you already have a chat, but new chats only pop up for Delta Chat messages.
This helps to decide on a case-by-case basis whether you want to have a
conversation in Delta Chat or in a “normal” e-mail app.</li>
</ul>
<h3 id="what-if-i-expect-a-message-from-someone-i-didnt-write-to-in-the-past">
What if I expect a message from someone I didn’t write to in the past? <a href="#what-if-i-expect-a-message-from-someone-i-didnt-write-to-in-the-past" class="anchor"></a>
</h3>
<ul>
<li>If a message comes from an unknown contact, it appears as a <strong>request</strong>. You
need to accept the request before you can reply.</li>
<li>You can also “delete” it if you don’t want to chat with them for now. This
does <em>not</em> delete the message on the server, only on your device. So you can
still deal with the message in a different mail app.</li>
<li>If you delete a request, future messages from that contact will still appear
as message request, so you can change your mind. If you really don’t want to
receive messages from this person, consider <em>blocking</em> them.</li>
</ul>
<h3 id="delta-chat-soporta-envío-de-imágenes-videos-documentos-y-otros-archivos">
¿Delta Chat soporta envío de imágenes, videos, documentos y otros archivos? <a href="#delta-chat-soporta-envío-de-imágenes-videos-documentos-y-otros-archivos" class="anchor"></a>
</h3>
<ul>
<li>
<p>Si. Además del texto sin formato, todos los archivos adjuntos de correo electrónico se muestran como mensajes separados. Los mensajes salientes obtienen archivos adjuntos según sea necesario automáticamente.</p>
</li>
<li>
<p>For performance, images are optimized and sent at a smaller size by default, but you can send it as a “file” to preserve the original.</p>
</li>
</ul>
<h3 id="multiple-accounts">
How can I add or switch between multiple accounts? <a href="#multiple-accounts" class="anchor"></a>
</h3>
<p>You can easily work with additional accounts on Delta Chat mobile and desktop clients by clicking either:</p>
<ul>
<li>on the menu button and then ‘Switch Account’ (Android and desktop)</li>
<li>or the profile icon and then ‘Add Account’ (iOS)</li>
</ul>
<p>You may also wish to learn <a href="#multiclient">how to add accounts to multiple devices</a>.</p>
<h3 id="quién-ve-mi-foto-de-perfil">
¿Quién ve mi foto de perfil? <a href="#quién-ve-mi-foto-de-perfil" class="anchor"></a>
</h3>
<ul>
<li>
<p>Puede agregar una foto de perfil en su configuración. Si escribe a sus contactos
o los agrega a través de un código QR, ellos lo verán automáticamente como su foto de perfil.</p>
</li>
<li>
<p>Los contactos que no usen Delta Chat no verán la foto de perfil
(a menos que instalen Delta Chat :)</p>
</li>
<li>
<p>Por cuestiones de privacidad, nadie verá su foto de perfil hasta que les escriba un mensaje.</p>
</li>
<li>
<p>Su foto de perfil no se envía con cada mensaje, pero con la frecuencia suficiente para
que sus contactos vuelvan a recibir su foto de perfil, incluso si agregan un nuevo
dispositivo.</p>
</li>
</ul>
<h3 id="delta-chat-soporta-mensajes-con-formato-html">
¿Delta Chat soporta mensajes con formato HTML? <a href="#delta-chat-soporta-mensajes-con-formato-html" class="anchor"></a>
</h3>
<p>Yes, incoming HTML messages come with a “Show full message” button.
Outgoing messages always use plain text.</p>
<h3 id="por-qué-debo-ingresar-mi-contraseña-de-correo-electrónico-en-delta-chat-es-esto-seguro">
¿Por qué debo ingresar mi contraseña de correo electrónico en Delta Chat? ¿Es esto seguro? <a href="#por-qué-debo-ingresar-mi-contraseña-de-correo-electrónico-en-delta-chat-es-esto-seguro" class="anchor"></a>
</h3>
<p>Al igual que con otros programas de correo electrónico como Thunderbird, K9-Mail o Outlook, el
programa necesita la contraseña para que pueda usarla para enviar correos. Por supuesto, la
contraseña se almacena solo en su dispositivo. La contraseña solo se transmite a
su proveedor de correo electrónico (cuando inicia sesión), que tiene acceso a sus correos de todos modos.</p>
<p>Si utiliza un proveedor de correo electrónico con soporte de OAuth2 como gmail.com o yandex.ru,
no es necesario almacenar su contraseña en el dispositivo. En este caso, solo se usa un
token de acceso.</p>
<p>Como Delta Chat es de Código Abierto, puedes investigar el Código Fuente si quieres verificar que tus credenciales son gestionadas de manera segura.
Estamos felices de recibir críticas que hagan la aplicación más segura para todos los usuarios.</p>
<h3 id="qué-permisos-necesita-delta-chat">
¿Qué permisos necesita Delta Chat? <a href="#qué-permisos-necesita-delta-chat" class="anchor"></a>
</h3>
<p>Dependiendo del sistema operativo en uso,
quizás se te solicite garantizar permisos a la app.
Esto es lo que hace Delta Chat con esos permisos:</p>
<ul>
<li>Camera <em>(puede ser desactivada)</em>
<ul>
<li>tomar fotos y videos: para enviar fotos</li>
</ul>
</li>
<li>Contactos <em>(puede ser desactivado)</em>
<ul>
<li>lectura de tus contactos: para descubrir con que contactos chatear</li>
</ul>
</li>
<li>Ubicación <em>(puede ser desactivada)</em>
<ul>
<li>acceder a la ubicación aproximada (recursos de localización en red): para la función de transmitir ubicación</li>
<li>acceder a la ubicación precisa (recursos de ubicación en red y GPS): para la función de transmitir ubicación</li>
</ul>
</li>
<li>Micrófono <em>(puede ser desactivado)</em>
<ul>
<li>grabar audio: para mensajes de audio</li>
</ul>
</li>
<li>Almacenamiento <em>(puede ser desactivado)</em>
<ul>
<li>modificar o borrar el contenido de tu tarjeta SD: para descargar los adjuntos de los mensajes</li>
<li>leer el contenido de tu tarjeta SD: para compartir archivos con tus contactos</li>
</ul>
</li>
<li>Otras capacidades de la app
<ul>
<li>modificar los ajustes de audio: así puedas elegir los ringtones y volumen para las notificaciones y mensajes de audio</li>
<li>lanzarse al inicio: así no tengas que iniciar Delta Chat de forma manual</li>
<li>control de vibración: para notificaciones</li>
<li>observar las conexiones de red: para conectarte a tu proveedor de correo electrónico</li>
<li>evitar que el teléfono duerma: así puedes copiar de forma sencilla el código de seguridad durante el mensaje de configuración de autoencriptación</li>
<li>tener acceso completo a la red: para conectarse a tu servidor de correo electrónico</li>
<li>mirar las conexiones de Wi-Fi: para conectarse a tu servidor de correo electrónico</li>
<li>ignorar optimizaciones de batería: para los usuarios que deseen recibir notificaciones en todo momento</li>
</ul>
</li>
</ul>
<h3 id="qué-significa-fijar-mutear-archivar">
¿Qué significa fijar, mutear, archivar? <a href="#qué-significa-fijar-mutear-archivar" class="anchor"></a>
</h3>
<p>Usa estas herramientas para organizar tus chats y mantener todo en su lugar:</p>
<ul>
<li>
<p><strong>Chats fijados</strong> siempre se mantienen al frente de tu listado. Puedes usarlos para acceder a tus chats preferidos de forma rápida o temporal para no olvidarte de tus cosas.</p>
</li>
<li>
<p><strong>Chats muteados</strong> si no quieres recibir notificaciones de ellos. Chats muteados se mantienen en su lugar e inclusive puedes fijarlos.</p>
</li>
<li>
<p><strong>Archive chats</strong> if you do not want to see them in your chat list any longer.
Archived chats remain accessible above the chat list or via search.</p>
</li>
<li>
<p>When an archived chat gets a new message, unless muted, it will <strong>pop out of the archive</strong> and back into your chat list.
<strong>Muted chats stay archived</strong> until you unarchive them manually.</p>
</li>
</ul>
<p>To archive or pin a chat, long tap (Android), use the chat’s menu (Android/Desktop) or swipe to the left (iOS);
to mute a chat, use the chat’s menu (Android/Desktop) or the chat’s profile (iOS).</p>
<h3 id="what-does-the-green-dot-mean">
What does the green dot mean? <a href="#what-does-the-green-dot-mean" class="anchor"></a>
</h3>
<ul>
<li>Since Delta Chat 1.34 you can sometimes see a “green dot” next to the avatar
of a contact. It means they were “recently seen”.</li>
<li>In detail: it means, that in the last 10 minutes, Delta Chat has seen them:
<ul>
<li>either because they messaged you directly,</li>
<li>because they wrote something to a group you are both a member of,</li>
<li>because they sent you a read receipt for a message you wrote,</li>
<li>or because they sent data to your Delta Chat app by using a
<a href="#webxdc">webxdc app</a>.</li>
</ul>
</li>
<li>So this is not a real time online status - and if someone doesn’t answer
right away even though they seem to be online, don’t worry and give them some
space ;-)</li>
<li>On the other hand, others will not always “see that you are online”. If you
have turned off read receipts, they will not see the green dot until you
message them or write to a group they’re in as well.</li>
</ul>
<h3 id="how-can-i-delete-my-account">
How can I delete my account? <a href="#how-can-i-delete-my-account" class="anchor"></a>
</h3>
<p>As you use an e-mail account for Delta Chat,
how you can delete your account depends on your e-mail provider.
We don’t have any control over your e-mail account,
so unfortunately we can’t help you with that.</p>
<p>If you want to keep the account,
but uninstall Delta Chat,
it is recommended to leave any group chat before uninstalling Delta Chat.</p>
<h2 id="grupos">
Grupos <a href="#grupos" class="anchor"></a>
</h2>
<h3 id="creación-de-un-grupo">
Creación de un grupo <a href="#creación-de-un-grupo" class="anchor"></a>
</h3>
<ul>
<li>Selecciona <strong>Nuevo chat</strong> y luego <strong>Nuevo grupo</strong> del menu en el sector superior derecho o toca en el botón correspondiente en Android/iOS.</li>
<li>En la siguiente pantalla selecciona a los <strong>miembros del grupo</strong> y define un <strong>nombre de grupo</strong>. Tambien puedes seleccionar un <strong>avatar de grupo</strong>.</li>
<li>Tan pronto escribas el <strong>primer mensaje</strong> en el grupo, todos los miembros serán informados sobre el nuevo grupo y podrán responder en él (mientras no escribas un mensaje será invisible para los miembros).</li>
</ul>
<h3 id="agregar-miembros-a-un-grupo">
Agregar miembros a un grupo <a href="#agregar-miembros-a-un-grupo" class="anchor"></a>
</h3>
<ul>
<li>Todos los miembros del grupo tienen los <strong>mismos derechos</strong> que los demás. Por esta razón, todos pueden eliminar o añadir miembros al grupo.</li>
<li>Para añadir o eliminar miembros, haga clic en el nombre del grupo en la pantalla de chat.</li>
</ul>
<h3 id="me-he-eliminado-por-accidente">
Me he eliminado por accidente. <a href="#me-he-eliminado-por-accidente" class="anchor"></a>
</h3>
<ul>
<li>Como ya no eres miembro del grupo, no puedes volver a agregarte.
Sin embargo, no hay problema, solo pídale a cualquier otro miembro del grupo en un chat normal que lo vuelva a agregar.</li>
</ul>
<h3 id="no-quiero-recibir-más-los-mensajes-de-un-grupo">
No quiero recibir más los mensajes de un grupo. <a href="#no-quiero-recibir-más-los-mensajes-de-un-grupo" class="anchor"></a>
</h3>
<ul>
<li>
<p>Elimínate de la lista de miembros o elimina todo el chat.
Si desea unirse al grupo nuevamente más tarde, pídale a otro miembro del grupo que lo agregue nuevamente.</p>
</li>
<li>
<p>Como alternativa, también puede “silenciar” a un grupo, lo que significa que recibirá todos los mensajes y
aún puede escribir, pero ya no se le notifican nuevos mensajes.</p>
</li>
</ul>
<h3 id="qué-significan-las-marcas-que-se-muestran-junto-a-los-mensajes-salientes">
¿Qué significan las marcas que se muestran junto a los mensajes salientes? <a href="#qué-significan-las-marcas-que-se-muestran-junto-a-los-mensajes-salientes" class="anchor"></a>
</h3>
<ul>
<li><strong>Una marca</strong> significa que el mensaje se ha enviado correctamente a su proveedor.</li>
<li><strong>Dos marcas</strong> significan que al menos el dispositivo de un destinatario
ha informado de tener recibido el mensaje.</li>
<li>Es posible que los destinatarios hayan desactivado recibos de lectura,
por lo que aunque sólo veas una marca, el mensaje puede haber sido leído.</li>
<li>A la inversa, dos marcas no significan automáticamente que un humano haya leído o entendido el mensaje ;)</li>
</ul>
<h3 id="what-happens-if-i-turn-on-delete-old-messages-from-server">
What happens if I turn on “Delete old messages from server”? <a href="#what-happens-if-i-turn-on-delete-old-messages-from-server" class="anchor"></a>
</h3>
<ul>
<li>
<p>By default, Delta Chat stores all messages locally on your device.
If you e.g. want to save storage space at your mail provider,
you can configure Delta Chat
to delete old already-received messages on the server automatically.
They still remain on your device until you delete them there, too.</p>
</li>
<li>
<p>To turn it on, go to <strong>Delete Old Messages → Delete Messages from Server</strong>
in the “Chats and Media” settings.
You can set a timeframe between “At once” and “After 1 year”.
All e-mails received by Delta Chat will be deleted from the server after this timeframe.</p>
</li>
<li>
<p>Note that if you use Delta Chat on more than one device,
you need to leave the message on the server with a sufficient timeframe
so that the other device(s) can download them, too.</p>
</li>
</ul>
<h3 id="delold">
What happens if I turn on “Delete old messages from device”? <a href="#delold" class="anchor"></a>
</h3>
<ul>
<li>If you want to save storage on your device, you can choose to delete old
messages automatically.</li>
<li>To turn it on, go to “delete old messages from device” in the “Chats &amp; Media”
settings. You can set a timeframe between “after an hour” and “after a year”;
this way, <em>all</em> messages will be deleted from your device as soon as they are
older than that.</li>
</ul>
<h2 id="encryption-and-security">
Encryption and Security <a href="#encryption-and-security" class="anchor"></a>
</h2>
<h3 id="which-standards-are-used-for-end-to-end-encryption">
Which standards are used for end-to-end encryption? <a href="#which-standards-are-used-for-end-to-end-encryption" class="anchor"></a>
</h3>
<p><a href="https://autocrypt.org">Autocrypt</a> is used for automatically
establishing end-to-end encryption with contacts and group chats.
Autocrypt uses a limited and <a href="#openpgp-secure">secure subset of the OpenPGP standard</a>.
End-to-End encrypted messages are marked with a padlock
<img style="vertical-align:middle; width:1.2em; margin:1px" src="../lock-icon.png" alt="padlock" />.</p>
<p><a href="https://countermitm.readthedocs.io/en/latest/new.html">Secure-Join protocols</a>
are used for establishing chats with guaranteed end-to-end encryption
which protects against network attacks and compromised servers.
Chats marked with a green checkmark
<img style="vertical-align:middle; width:1.5em; margin:1px" src="../green-checkmark.png" alt="green checkmark" />
guarantee end-to-end encrypted messages.</p>
<h3 id="whene2e">
How can i know if messages are end-to-end encrypted? <a href="#whene2e" class="anchor"></a>
</h3>
<p>All end-to-end encrypted messages carry a padlock:</p>
<p><img style="width:160px; margin:1px" src="../lock-screenshot.png" alt="padlock in bubble" /></p>
<p>End-to-end encryption is guaranteed if there is a green checkmark next to the chat title:</p>
<p><img style="width:211px; margin:1px" src="../green-checkmark-screenshot.png" alt="green checkmark in title" /></p>
<h3 id="howtoe2ee">
How can I get guaranteed end-to-end encryption and green checkmarks? <a href="#howtoe2ee" class="anchor"></a>
</h3>
<p>Meet your chat partner outside Delta Chat, preferably in person
but a second channel like a video chat
or a different messenger is fine as well.
Perform the following QR show/scan procedure with your chat partner.
One of you is the “Inviter”, the other is the “Joiner”.</p>
<p><strong>Inviter side</strong>:</p>
<ul>
<li>
<p>Group invitation:
Tap the chat group title to see its member list, and select “QR Invite code”.
Share the QR image with the other side either in person or through a second channel.</p>
</li>
<li>
<p>Direct 1:1 chat invitation:
Tap the QR Code icon <img style="vertical-align:middle; width:1.8em; margin:1px" src="../qr-icon.png" />
on the Delta Chat app main screen –
on Desktop the QR Icon is in the left-side sandwich menu.
Share the QR image with the other side either in person or through a second channel.</p>
</li>
</ul>
<p><strong>Joiner side</strong>:</p>
<ul>
<li>
<p>Tap the QR Code icon <img style="vertical-align:middle; width:1.8em; margin:1px" src="../qr-icon.png" />
on the Delta Chat app main screen –
on Desktop the QR Icon is in the left-side sandwich menu.</p>
</li>
<li>
<p>Choose “SCAN QR CODE” and scan the QR Code
that you see from your chat partner in a second channel.</p>
</li>
<li>
<p>Tap “OK”</p>
</li>
</ul>
<p><strong>Both Inviter and Joiner</strong>:</p>
<p>Wait while <a href="https://countermitm.readthedocs.io/en/latest/new.html#setup-contact-protocol">Secure-Join network messages are exchanged</a> between both devices.</p>
<ul>
<li>
<p>If both devices are online,
both sides will eventually see a (group or direct) chat with a green checkmark
<img style="vertical-align:middle; width:1.5em; margin:1px" src="../green-checkmark.png" alt="green checkmark" />
next to the title.</p>
</li>
<li>
<p>If one of the devices is offline, the green checkmarks will only
appear later when the device is internet-connected again
and the Secure-Join network protocol completed.</p>
</li>
</ul>
<p>Congratulations!
You now will automatically use guaranteed end-to-end encryption
with this contact and both of you can add each other to green-checkmarked groups
<img style="vertical-align:middle; width:1.5em; margin:1px" src="../green-checkmark.png" alt="green checkmark" />,
thereby automatically spreading guaranteed end-to-end encryption among its members.</p>
<h3 id="e2eeguarantee">
What does the green checkmark and “guaranteed end-to-end encryption” mean? <a href="#e2eeguarantee" class="anchor"></a>
</h3>
<p>Chat titles with green checkmarks
<img style="vertical-align:middle; width:1.5em; margin:1px" src="../green-checkmark.png" alt="green checkmark" />
mean that all messages in the chat will be end-to-end encrypted
and can not be read or altered by compromised e-mail servers or Internet providers.
Joining green-checkmarked group chats
safely spreads everybody’s encryption information (and green checkmarks)
in a manner that guarantees end-to-end encryption in the group and among members.</p>
<p>Contact profiles with green checkmarks
<img style="vertical-align:middle; width:1.5em; margin:1px" src="../green-checkmark.png" alt="green checkmark" />
mean that messaging a contact is currently guaranteed to be end-to-end encrypted.
Every green-checkmarked contact either did a direct <a href="#howtoe2ee">QR-scan</a> with you
or was introduced by a another green-checkmarked contact.
Introductions happen automatically when adding members to groups.
Whoever adds a contact to a green-checkmarked group becomes an introducer
to those members who didn’t yet know about the added contact.
In a contact profile you can tap on the “Introduced by …” text repeatedly
until you get to the one with whom you directly did a <a href="#howtoe2ee">QR-scan</a>.</p>
<p>Note that in a contact profile you may see and tap introducers
but there is no green checkmark in the profile title.
This usually means that the contact <a href="#nocryptanymore">“sent a message from another device”</a>.</p>
<p>For more in-depth discussion of “guaranteed end-to-end encryption”
please see <a href="https://countermitm.readthedocs.io/en/latest/new.html">Secure-Join protocols</a>
and specifically read about “Verified Groups”, the technical term
of what is called here “green-checkmarked” or “guaranteed end-to-end encrypted” chats.</p>
<h3 id="nocryptanymore">
A contact “sent a message from another device”, what can i do? <a href="#nocryptanymore" class="anchor"></a>
</h3>
<p>Your chat with a contact lost guaranteed end-to-end encryption.
The green checkmark was removed for this chat and contact when you see this warning.
<strong>If you find the sudden drop of guaranteed end-to-end encryption
surprising for this contact then don’t accept the warning!</strong>
Instead check with your contact through a second channel
like a video call, other messenger or a phone call,
to find out what happened.</p>
<p>If your contact actually caused the drop of guaranteed end-to-end encryption
please see the next paragraphs for common reasons and their mitigations.
Regardless, all other green-checkmarked chats remain guaranteed end-to-end encrypted
even if the contact is a member there.</p>
<p><strong>Your contact is using Delta Chat on a second device (phone or laptop)</strong></p>
<p>If they have another device with a Delta Chat app running,
they should remove the account from the new device
and add it <a href="#multiclient">as a second device as described here</a>.
As soon as they message you afterwards, the warning will be gone
and guaranteed encryption is established with both devices of your contact.</p>
<p><strong>Your contact reinstalled Delta Chat using their old account login</strong></p>
<p>If they have <a href="#backup">a backup file</a>,
they should remove the account from the new device
and rather import the backup file to re-create their account.
As soon as they message you afterwards, the warning will be gone
and guaranteed encryption is re-established for this contact.</p>
<p>If they don’t have a backup file, it’s best to perform a <a href="#howtoe2ee">QR scan</a>
with your chat partner to re-establish guaranteed end-to-end encryption.</p>
<p><strong>Your contact sent a mail through a webmail interface or another e-mail app
and will get back to using Delta Chat soon again.</strong></p>
<p>If you are sure that the contact sometimes uses webmail,
or another mail app lacking end-to-end encryption,
then you may accept the warning.
As soon as your contact uses Delta Chat again,
guaranteed end-to-end encryption will be automatically re-established.</p>
<p><strong>Your contact stopped using Delta Chat entirely</strong></p>
<p>Sometimes remaining in contact is more important than end-to-end encryption.
<a href="#tls">“Transport Layer Encryption” (TLS)</a> may still meaningfully protect
the confidentiality of your messages between your device and the e-mail server.
But without end-to-end encryption you and your contract are trusting your e-mail server
to not read or manipulate your messages, and to not hand them to third parties.</p>
<p>In any case, you can not do much else than accept the warning.
Please also remove the contact from any active green-checkmarked group
which you can find in “Shared chats” in the Contact profile.
This spares your contact from getting “unreadable” messages.</p>
<p>If the contact removed Delta Chat because of buggy or undesirable behaviour,
please consider posting to our <a href="https://support.delta.chat">support forum</a>
to help us identify and address common problems. Thanks!</p>
<h3 id="are-attachments-pictures-files-audio-etc-end-to-end-encrypted">
Are attachments (pictures, files, audio etc.) end-to-end encrypted? <a href="#are-attachments-pictures-files-audio-etc-end-to-end-encrypted" class="anchor"></a>
</h3>
<p>Yes.</p>
<p>When we talk about an “end-to-end encrypted message”
we always mean a whole message is encrypted,
including all the attachments
and attachment metadata such as filenames.</p>
<h3 id="openpgp-secure">
Is OpenPGP secure? <a href="#openpgp-secure" class="anchor"></a>
</h3>
<p>Yes, Delta Chat uses a secure subset of OpenPGP
and only displays a padlock security indicator on a message
if the whole message is properly encrypted and signed.
For example, “Detached signatures” are not treated as secure.</p>
<p>OpenPGP is not insecure by itself.
Most publically discussed OpenPGP security problems
actually stem from bad usability or bad implementations of tools or apps (or both).
It is particularly important to distinguish between OpenPGP, the IETF encryption standard,
and GnuPG (GPG), a command line tool implementing OpenPGP.
Many public critiques of OpenPGP actually discuss GnuPG which Delta Chat has never used.
Delta Chat rather uses the OpenPGP Rust implementation <a href="https://github.com/rpgp/rpgp">rPGP</a>,
available as <a href="https://crates.io/crates/pgp">an independent “pgp” package</a>,
and <a href="https://delta.chat/assets/blog/2019-first-security-review.pdf">security-audited in 2019</a>.</p>
<p>We aim, along with other OpenPGP implementors,
to further improve security characteristics by implementing the
<a href="https://datatracker.ietf.org/doc/draft-ietf-openpgp-crypto-refresh/">new IETF OpenPGP Crypto-Refresh</a>
which was thankfully adopted in summer 2023.</p>
<h3 id="openpgp-alternatives">
Did you consider using alternatives to OpenPGP for end-to-end -encryption? <a href="#openpgp-alternatives" class="anchor"></a>
</h3>
<p>Yes, we are following efforts like <a href="https://en.wikipedia.org/wiki/Messaging_Layer_Security">MLS</a>
or <a href="https://saltpack.org/">Saltpack</a>
but adopting them would mean breaking end-to-end encryption interoperability
with all other e-mail apps that typically support OpenPGP encryption.
So it would not be a light decision to take
and there must be tangible improvements for users.</p>
<p>Delta Chat takes a holistic “usable security” approach
and works with a wide range of activist groupings as well as
renowned researchers such as <a href="https://teamusec.de">TeamUSEC</a>
to improve actual user outcomes against security threats.
The wire protocol and standard for establishing end-to-end encryption is
only one part of “user outcomes”,
see also our answers to <a href="#device-seizure">device-seizure</a>
and <a href="#message-metadata">message-metadata</a> questions.</p>
<h3 id="is-delta-chat-vulnerable-to-efail">
Is Delta Chat vulnerable to EFAIL? <a href="#is-delta-chat-vulnerable-to-efail" class="anchor"></a>
</h3>
<p>No, <a href="https://delta.chat/en/2018-05-15-delta-chat-not-vulnerable-to-efail">Delta Chat never was vulnerable to EFAIL</a>
because its OpenPGP implementation <a href="https://github.com/rpgp/rpgp">rPGP</a>
uses Modification Detection Code when encrypting messages
and returns <a href="https://docs.rs/pgp/latest/pgp/errors/enum.Error.html#variant.MdcError">an error</a>
if the Modification Detection Code is incorrect.</p>
<p>Delta Chat also never was vulnerable to the “Direct Exfiltration” EFAIL attack
because it only decrypts <code class="language-plaintext highlighter-rouge">multipart/encrypted</code> messages
which contain exactly one encrypted and signed part,
as defined by the Autocrypt Level 1 specification.</p>
<h3 id="tls">
Is a message exposed in cleartext if end-to-end encryption is not available? <a href="#tls" class="anchor"></a>
</h3>
<p>Even if your messages are not guaranteed to be end-to-end encrypted,
they are still protected from Internet providers like cell or cable companies.
However, your and your recipient’s e-mail providers
may read, analyze or even modify your messages,
including any attachments,
if they are not end-to-end encrypted.</p>
<p>Delta Chat by default uses strict
<a href="https://en.wikipedia.org/wiki/Transport_Layer_Security">TLS encryption</a>
which secures connections between your device and your e-mail provider.
All of Delta Chat’s TLS-handling has been independently <a href="#security-audits">security audited</a>.
Moreover, the connection between your and the recipient’s e-mail provider
will typically be transport-encrypted as well.
If the involved e-mail servers support <a href="https://datatracker.ietf.org/doc/html/rfc8461">MTA-STS</a>
then transport encryption will be enforced between e-mail providers
in which case Delta Chat communications will never be exposed in cleartext to the Internet
even if the message was not end-to-end encrypted.</p>
<p>Note that <a href="#howtoe2ee">maintaining guaranteed end-to-end encryption</a> on top of TLS encryption
provides pervasive safety between your and the recipient’s devices.
Not even your e-mail or Internet provider will be able to read or modify your messages.</p>
<h3 id="message-metadata">
How does Delta Chat protect metadata in messages? <a href="#message-metadata" class="anchor"></a>
</h3>
<p>Delta Chat protects most message metadata by putting the following information
into the end-to-end encrypted part of messages:</p>
<ul>
<li>Subject line</li>
<li>Group avatar and name</li>
<li>MDN (read receipt) requests (<code class="language-plaintext highlighter-rouge">Chat-Disposition-Notification-To</code>)</li>
<li>Disappearing message timer (<code class="language-plaintext highlighter-rouge">Ephemeral-Timer</code>)</li>
<li><code class="language-plaintext highlighter-rouge">Chat-Group-Member-Removed</code>, <code class="language-plaintext highlighter-rouge">Chat-Group-Member-Added</code></li>
<li><code class="language-plaintext highlighter-rouge">Secure-Join</code> header containing secure join commands</li>
<li>Notification about enabling location streaming</li>
<li>WebRTC room URL</li>
</ul>
<p>E-Mail servers do not get access to this protected metadata
but they do see the message date as well as the message size,
and, more importantly, the sender and receiver addresses.
E-mail servers need receiver addresses to route and
deliver messages to recipient’s devices.</p>
<h3 id="device-seizure">
How to protect metadata and contacts when a device is seized? <a href="#device-seizure" class="anchor"></a>
</h3>
<p>Both for protecting against metadata-collecting e-mail servers
as well as against the threat of device seizure
we recommend to use a Delta Chat optimized <a href="https://delta.chat/serverguide">e-mail server instance</a>
to create pseudonymous temporary accounts through QR-code scans.
Note that Delta Chat apps on all platforms support multiple accounts
so you can easily use action-specific “1-week” or “1-month” accounts next to your “main” account
with the knowledge that all temporary account data, along with all metadata, will be deleted.
Moreover, if a device is seized then contacts using temporary e-mail accounts
can not be identified easily, as compared to messengers which reveal
phone numbers in chat groups which in turn are often associated with legal identities.</p>
<h3 id="how-can-i-check-encryption-information">
How can i check encryption information? <a href="#how-can-i-check-encryption-information" class="anchor"></a>
</h3>
<p>You may check the end-to-end encryption status manually in the “Encryption” dialog
(user profile on Android/iOS or right-click a user’s chat-list item on desktop).
Delta Chat shows two fingerprints there.
If the same fingerprints appear on your own and your contact’s device,
the connection is safe.</p>
<h3 id="how-can-i-check-the-encryption-status-of-messages">
How can I check the encryption status of messages? <a href="#how-can-i-check-the-encryption-status-of-messages" class="anchor"></a>
</h3>
<p>A little <strong>padlock</strong> in a message bubble denotes
that the message was properly end-to-end encrypted from the given sender.
If there is <strong>no padlock</strong>, the message was not properly end-to-end encrypted
most likely because the sender uses an app or webmail interface
without support for end-to-end–encryption.</p>
<h3 id="why-do-i-see-unencrypted-messages">
Why do I see unencrypted messages? <a href="#why-do-i-see-unencrypted-messages" class="anchor"></a>
</h3>
<p>If a contact uses a non-Autocrypt e-mail app,
all messages involving this contact (in a group or 1:1 chat)
will not be end-to-end encrypted, and thus not show a “padlock” with messages.
Note that even if your contacts use Delta Chat on their account,
they might also use a non-Autocrypt e-mail app on that account
which then may cause intermittently unencrypted messages.
Replying unencrypted to unencrypted messages is mandated by Autocrypt
to prevent unreadable messages on the side of your contacts
and their non-Autocrypt e-mail app.</p>
<h3 id="how-can-i-get-an-end-to-end-encrypted-chat-with-a-delta-chat-contact-who-sometimes-uses-webmail-or-another-non-autocrypt-e-mail-app">
How can i get an end-to-end encrypted chat with a Delta Chat contact who sometimes uses webmail or another non-Autocrypt e-mail app? <a href="#how-can-i-get-an-end-to-end-encrypted-chat-with-a-delta-chat-contact-who-sometimes-uses-webmail-or-another-non-autocrypt-e-mail-app" class="anchor"></a>
</h3>
<p>If you need a safely end-to-end encrypted chat with a contact
who is using their account both with Delta Chat and non-Autocrypt apps (e.g. webmail),
it’s best to setup <a href="#howtoe2ee">guaranteed end-to-end encryption with them</a>
and then create a guaranteed end-to-end encrypted group chat with you two as members.
In this group chat all messages will be end-to-end encrypted
even if the direct chat between you two has a
<a href="#nocryptanymore">“… sent a message from another device”</a> warning.</p>
<h3 id="how-can-i-ensure-message-end-to-end-encryption-and-deletion">
How can I ensure message end-to-end encryption and deletion? <a href="#how-can-i-ensure-message-end-to-end-encryption-and-deletion" class="anchor"></a>
</h3>
<p>The best way to ensure every message is end-to-end encrypted,
and metadata deleted as quickly as possible
is <a href="#howtoe2ee">using chats with guaranteed end-to-end encryption</a>
and turning on disappearing messages.</p>
<p>Guranteed end-to-end encrypted chats protect against <a href="https://en.wikipedia.org/wiki/Man-in-the-middle_attack">MITM attacks</a>
and turning on “disappearing messages” deletes the messages
on the server after a user-configured time.</p>
<p>If you don’t need a longer-lived copy of your messages on the server,
you can also turn on <a href="#delold">“delete messages from server automatically”</a>.</p>
<h3 id="pfs">
Does Delta Chat support Perfect Forward Secrecy? <a href="#pfs" class="anchor"></a>
</h3>
<p>No, Delta Chat doesn’t support Perfect Forward Secrecy (PFS).
This means that if your Delta Chat private decryption key is leaked,
and someone has collected your prior in-transit messages,
they will be able to decrypt and read them using the leaked decryption key.</p>
<p>Note, however, that if anyone obtains to your decryption keys,
they will typically also be able to obtain your messages,
irrespective if Perfect Forward Secrecy is in place or not.
The typical real-world situation for leaked decryption keys is device seizure
which we discuss in our answer <a href="#device-seizure">on metadata and device seizure</a>.</p>
<p>It is possible that Delta Chat evolves to support Perfect Forward Secrecy,
because OpenPGP is just a container for encrypted messages
but encryption key management (and thus key rotation or key “ratcheting”)
could be organized in flexible ways.
See <a href="https://gitlab.com/sequoia-pgp/openpgp-dr">Seqouia’s PFS prototype</a>
for existing experiments in the OpenPGP implementor community.</p>
<h3 id="is-end-to-end-encryption-of-delta-chat-as-safe-as-signal">
Is end-to-end encryption of Delta Chat as safe as Signal? <a href="#is-end-to-end-encryption-of-delta-chat-as-safe-as-signal" class="anchor"></a>
</h3>
<p>It depends on what is important to you.
Delta Chat <a href="#pfs">does not support PFS</a> like Signal does
but it provides <a href="#e2eeguarantee">guaranteed end-to-end encrypted chats</a>
that are safe against compromised servers or corrupted networks.
Signal and most other PFS-supporting messengers do not provide
a practical scheme for protecting chat groups from network attacks
which are arguably more worrysome
than a potential attacker who seizes your phone and private encryption setup
but somehow not your messages, yet has a full record of all
past encrypted messages.</p>
<p>In any case, Delta Chat’s end-to-end encryption uses a <a href="#openpgp-secure">secure subset of OpenPGP</a>
which has been <a href="https://delta.chat/assets/blog/2019-first-security-review.pdf">independently security-audited</a>.</p>
<h3 id="puedo-reutilizar-mi-llave-privada-existente">
¿Puedo reutilizar mi llave privada existente? <a href="#puedo-reutilizar-mi-llave-privada-existente" class="anchor"></a>
</h3>
<p>Yes.
The best way is to send an Autocrypt Setup Message from the other e-mail client.
Look for something like <strong>Start Autocrypt Setup Transfer</strong> in the settings of the other client and follow the instructions shown there.</p>
<p>Alternatively, you can import the key manually in “Settings -&gt; Advanced settings -&gt; Import secret keys”.
Caution: Make sure the key is not protected by a password, or remove the password beforehand.</p>
<p>If you don’t have a key or don’t even know you would need one - don’t worry: Delta Chat generates keys as needed, you don’t have to hit a button for it.</p>
<h3 id="no-puedo-importar-mi-clave-pgp-existente-en-delta-chat">
No puedo importar mi clave PGP existente en Delta Chat. <a href="#no-puedo-importar-mi-clave-pgp-existente-en-delta-chat" class="anchor"></a>
</h3>
<p>The most likely cause is that your key is encrypted and/or uses
a password. Such keys are not supported by Delta Chat. You could remove the
passphrase encryption and the password and try the import again. If you want
to keep your passphrase you’ll have to create an e-mail alias for use
with Delta Chat such that Delta Chat’s key is tied to this e-mail alias.</p>
<p>Delta Chat supports common OpenPGP private key formats, however, it
is unlikely that private keys from all sources will be fully supported. This
is not the main goal of Delta Chat. In fact, the majority of new users
will not have any key prior to using Delta Chat.
We do, however, try to support private keys from as many sources as possible.</p>
<p>Removing the password from the private key will depend on the
software you use to manage your PGP keys. With Enigmail, you can set your
password to an empty value in the Key Management window. With GnuPG you can set
it <a href="https://github.com/deltachat/deltachat-android/issues/98#issuecomment-378383429">via the command
line</a>.
For other programs, you should be able to find a solution online.</p>
<h2 id="multiclient">
Múltiples dispositivos <a href="#multiclient" class="anchor"></a>
</h2>
<h3 id="puedo-usar-delta-chat-en-varios-dispositivos-al-mismo-tiempo">
¿Puedo usar Delta Chat en varios dispositivos al mismo tiempo? <a href="#puedo-usar-delta-chat-en-varios-dispositivos-al-mismo-tiempo" class="anchor"></a>
</h3>
<p>Yes. Delta Chat 1.36 comes with a new, experimental function for using the same account on different devices:</p>
<ul>
<li>
<p>Make sure both devices are on the same Wi-Fi or network</p>
</li>
<li>
<p>On the first device, go to <strong>Settings → Add Second Device</strong>, unlock the screen if needed
and wait a moment until a QR code is shown</p>
</li>
<li>
<p>On the second device, <a href="https://get.delta.chat">install Delta Chat</a></p>
</li>
<li>
<p>On the second device, start Delta Chat, select <strong>Add as Second Device</strong>, and scan the QR code from the old device</p>
</li>
<li>
<p>Transfer should start after a few seconds and during transfer both devices will show the <strong>progress</strong>.
Wait until it is finished on both devices.</p>
</li>
</ul>
<p>In contrast to many other messengers, after successful transfer,
both <strong>devices are completely independent.</strong>
One device is not needed for the other to work.</p>
<h3 id="troubleshooting">
Troubleshooting <a href="#troubleshooting" class="anchor"></a>
</h3>
<ul>
<li>
<p>Double-check both devices are in the <strong>same Wi-Fi or network</strong></p>
</li>
<li>
<p>Your system might have a “personal firewall”,
which is known to cause problems (especially on Windows).
<strong>Disable the personal firewall</strong> for Delta Chat on both ends and try again</p>
</li>
<li>
<p>Ensure there is <strong>enough storage</strong> on the destination device</p>
</li>
<li>
<p>If transfer started, make sure, the devices <strong>stay active</strong> and do not fall asleep.
Do not exit Delta Chat.
(we try hard to make the app work in background, but <a href="https://dontkillmyapp.com">systems tend to kill apps</a>, unfortunately)</p>
</li>
<li>
<p>Delta Chat is <strong>already logged in</strong> on the destination device?
You can use multiple accounts per device, just <a href="#multiple-accounts">add another account</a></p>
</li>
<li>
<p>If you still have problems or if you <strong>cannot scan a QR code</strong>
try the <strong>manual transfer</strong> described below</p>
</li>
</ul>
<h3 id="backup">
Manual Transfer <a href="#backup" class="anchor"></a>
</h3>
<p>This method is only recommended if “Add Second Device” as described above does not work.</p>
<ul>
<li>On the old device, go to “Settings -&gt; Chats and media -&gt; Export Backup”. Enter your
screen unlock PIN, pattern, or password. Then you can click on “Start
Backup”. This saves the backup file to your device. Now you have to transfer
it to the other device somehow.</li>
<li>On the new device, on the login screen, instead of logging into your email
account, choose “Import Backup”. After import, your conversations, encryption
keys, and media should be copied to the new device.
<ul>
<li><strong>If you use iOS:</strong> and you encounter difficulties, maybe
<a href="https://support.delta.chat/t/import-backup-to-ios/1628">this guide</a> will
help you.</li>
</ul>
</li>
<li>You are now synchronized, and can use both devices for sending and receiving
end-to-end encrypted messages with your communication partners.</li>
</ul>
<h3 id="tienen-planeado-crear-un-cliente-web-de-delta-chat">
¿Tienen planeado crear un cliente web de Delta Chat? <a href="#tienen-planeado-crear-un-cliente-web-de-delta-chat" class="anchor"></a>
</h3>
<ul>
<li>No hay planes inmediatos, pero sí algunas ideas preliminares.</li>
<li>Hay 2-3 vías para introducir un cliente web de Delta Chat, pero todas son
trabajo significativo. Por ahora, nos centramos en conseguir versiones estables en todas las
tiendas de aplicaciones (Google Play/iOS/Windows/macOS/Linux repositorios) como aplicaciones nativas.</li>
<li>Si necesitas un cliente web, porque no tienes permiso para instalar software en
el ordenador con que trabajas, puedes utilizar el cliente portátil Windows Desktop Client
o el AppImage para Linux. Puedes encontrarlos en
<a href="https://get.delta.chat">get.delta.chat</a>.</li>
</ul>
<h3 id="para-qué-sirve-la-configuración-enviar-autocopia">
¿Para qué sirve la configuración “Enviar autocopia”? <a href="#para-qué-sirve-la-configuración-enviar-autocopia" class="anchor"></a>
</h3>
<p>Enviar una copia de sus mensajes a usted mismo asegura que recibirá sus propios mensajes en todos los dispositivos. Si tiene varios dispositivos y no habilita esta opción, solo verá los mensajes de otras personas y los mensajes que envíe desde el dispositivo actual.</p>
<p>La copia se envía a la bandeja de entrada y luego se mueve a la carpeta DeltaChat; no se coloca en la carpeta “Enviados”. Delta Chat <em>nunca</em> carga nada en la carpeta Enviados porque esto significaría cargar un mensaje dos veces (una a través de SMTP y otra a través de IMAP en la carpeta Enviados).</p>
<p>La configuración predeterminada para “Enviar autocopia” es “no”.</p>
<h3 id="por-qué-puedo-elegir-monitorear-la-carpeta-enviados">
¿Por qué puedo elegir monitorear la carpeta “Enviados”? <a href="#por-qué-puedo-elegir-monitorear-la-carpeta-enviados" class="anchor"></a>
</h3>
<p>La única razón por la que uno quiere ver la carpeta Enviados es si está utilizando otro
programa de correo (como Thunderbird) a la vez que su aplicación Delta Chat, y desea que su MUA
también participe en conversaciones de chat.</p>
<p>No obstante, recomendamos utilizar el cliente de escritorio Delta Chat; puede descargarlo
en <a href="https://get.delta.chat">get.delta.chat</a>. La opción de observar la carpeta “Enviados”
podría desaparecer en el futuro. Se introdujo en un momento en que no había
cliente Delta Chat Desktop disponible en todas las plataformas.</p>
<h3 id="por-qué-puedo-elegir-no-monitorear-la-carpeta-deltachat">
¿Por qué puedo elegir no monitorear la carpeta DeltaChat? <a href="#por-qué-puedo-elegir-no-monitorear-la-carpeta-deltachat" class="anchor"></a>
</h3>
<p>Algunas personas usan Delta Chat como un cliente de correo electrónico normal y desean mantener los correos en la bandeja de entrada, en lugar de la carpeta DeltaChat. Si deshabilita “Monitorear carpeta DeltaChat”, también debe deshabilitar “mover automáticamente a la carpeta DeltaChat”.
De lo contrario, eliminar mensajes o configuraciones de dispositivos múltiples podría no funcionar correctamente.</p>
<h2 id="webxdc">
webxdc apps <a href="#webxdc" class="anchor"></a>
</h2>
<p>In Delta Chat, you can share <a href="https://webxdc.org">webxdc apps</a>, attachments with an <code class="language-plaintext highlighter-rouge">.xdc</code> file
extension. They can do very different things, and make Delta Chat a truly
extendable messenger.</p>
<h3 id="how-private-are-webxdc-apps">
How private are webxdc apps? <a href="#how-private-are-webxdc-apps" class="anchor"></a>
</h3>
<ul>
<li>webxdc apps can not send data to the Internet, or download anything.</li>
<li>A webxdc app can only exchange data within a Delta Chat chat, with its
copies on the devices of your chat partners. Other than that, it’s completely
isolated from the Internet.</li>
<li>The privacy a webxdc app offers is the privacy of your chat - as long as you
trust the people you chat with, you can trust the webxdc app as well.</li>
<li>This also means: it can be a privacy risk to open webxdc apps in chats where
you don’t trust the members - as you know it from e-mail attachments, where
you only open attachments from senders you trust, and not from spammers.</li>
</ul>
<h3 id="where-can-i-get-webxdc-apps">
Where can I get webxdc apps? <a href="#where-can-i-get-webxdc-apps" class="anchor"></a>
</h3>
<ul>
<li>In general, anyone can share webxdc apps with each
other without restrictions.</li>
<li>You can <a href="https://delta.chat/en/2023-08-11-xstore">send ‘hi’ to xstore@testrun.org</a>
to see an experimental webxdc appstore.
All of the apps are open source and for free.</li>
<li>Many people write their own webxdc apps and post them to <a href="https://support.delta.chat/c/webxdc/20">the Delta Chat
forum</a>.</li>
</ul>
<h3 id="how-can-i-create-my-own-webxdc-apps">
How can I create my own webxdc apps? <a href="#how-can-i-create-my-own-webxdc-apps" class="anchor"></a>
</h3>
<ul>
<li>webxdc apps are just zip files containing html, css, and javascript code.</li>
<li>You can extend the <a href="https://github.com/webxdc/hello">Hello World example app</a>
to get started.</li>
<li>All else you need to know is written in the
<a href="https://docs.webxdc.org/">documentation</a>.</li>
<li>If you have question, you can ask others with experience in the <a href="https://support.delta.chat/c/webxdc/20">Delta Chat
Forum</a>.</li>
</ul>
<h2 id="experimental-features">
Experimental Features <a href="#experimental-features" class="anchor"></a>
</h2>
<p>We are very grateful for feedback on these features - do you want to share
your ideas? Join the <a href="https://support.delta.chat">Forum</a> to contribute.
You may conveniently login via Delta Chat and a QR code scan,
another rather stable experiment we run on the side (sic!).</p>
<h3 id="how-can-i-use-audiovideo-calls-with-delta-chat">
How can I use audio/video calls with Delta Chat? <a href="#how-can-i-use-audiovideo-calls-with-delta-chat" class="anchor"></a>
</h3>
<ul>
<li>To turn on audio/video calls, go to the “experimental features” section in
the advanced settings and choose a “Video Chat Instance”.</li>
<li>When you invite others to a video chat, it is opened in your browser/app at
once. The others receive an e-mail with a link to the video chat.
This way, it is also compatible if your chat partners don’t use Delta Chat.</li>
<li>Note that there is no ring tone on the other side, and your chat partners
will not get interrupted by a video chat invite.</li>
<li>You can use any video chat service which allows joining by link. Just add the
link in the settings.</li>
<li>For example, to use the flagship Jitsi Meet instance, you could enter
<code class="language-plaintext highlighter-rouge">https://meet.jit.si/$ROOM</code>. The <code class="language-plaintext highlighter-rouge">$ROOM</code> variable will be a random value;
this way, you will have a new random jitsi room every time you call someone.</li>
</ul>
<h3 id="what-are-broadcast-lists-and-how-can-i-use-them">
What are Broadcast Lists and how can I use them? <a href="#what-are-broadcast-lists-and-how-can-i-use-them" class="anchor"></a>
</h3>
<ul>
<li>With a Broadcast List you can send a message to many recipents at once; when
they reply to you, you get the reply in your direct 1:1 chat with them. The
recipients can’t see each other.</li>
<li>Technically, it is an E-Mail with many recipients in BCC.</li>
<li>You can turn on the feature in the “experimental features” section in the
advanced settings. Then you can create a Broadcast List from the “New Chat”
dialog.</li>
<li>In case you are using more than one device, Broadcast Lists are currently not
synced between them.</li>
<li>Messages sent to broadcast lists are not encrypted. Encryption would break
anonymity, because then all recipients would know who else received it
(Sending individual mails to everyone would be worse for rate limit and network
consumption reason).</li>
</ul>
<h3 id="how-can-i-share-my-location-with-my-chat-partners">
How can I share my location with my chat partners? <a href="#how-can-i-share-my-location-with-my-chat-partners" class="anchor"></a>
</h3>
<ul>
<li>You can turn on location streaming in the “experimental features” section of
the advanced settings.</li>
<li>Now, if you want to share your location in a chat, go to “attach” and select
“location”. You can now set a time frame in which your location will be
streamed to your chat partners, between 5 minutes and 6 hours.</li>
<li>When your location changes, the others in the chat can view it on a map in
the chat.</li>
<li>To see the map and view locations of others, you need to turn on the feature
in the advanced settings.</li>
<li>This feature will not share your location with anyone except your chat
partners. <em>But:</em> to show the map, we need to download map tiles from
mapbox.com, so if you <em>view</em> the map, mapbox.com is asked for the map of a
specific area. If this is a privacy risk for you, this feature might not be
for you. We are working on finding a decentralized alternative for Mapbox.</li>
<li>On desktop, the OS typically can’t determine your location. Instead you can
right click on the map and describe a location, which is sent to the chat as
a message, but also appears on the map.</li>
</ul>
<h3 id="what-does-the-experimental-database-encryption-actually-protect">
What does the experimental database encryption actually protect? <a href="#what-does-the-experimental-database-encryption-actually-protect" class="anchor"></a>
</h3>
<ul>
<li>Right now, the database encryption is still very experimental. Don’t rely on
it for protection, you should additionally use encryption of your operating
system, if it provides any.</li>
<li>The database encryption does not yet encrypt the blobs, only the rows and
columns of the database. This more or less means that your messages are safe,
but not your attachments.</li>
<li>For iOS and Android, the encryption keys are stored in the system keychain.
This means the encryption is as secure as the operating system it’s running
on.</li>
<li>The Delta Chat desktop client doesn’t offer database encryption yet, as there
is no standard way to store the encryption keys on the different supported
platforms.</li>
</ul>
<h3 id="why-can-i-choose-to-only-watch-the-deltachat-folder">
Why can I choose to only watch the DeltaChat folder? <a href="#why-can-i-choose-to-only-watch-the-deltachat-folder" class="anchor"></a>
</h3>
<p>Esta es una configuración experimental para algunas personas que están experimentando con reglas del lado del servidor. No todos los proveedores lo admiten, pero con algunos puede mover todos los correos con el encabezado “Chat-Version” a la carpeta DeltaChat. Normalmente, esto lo haría la aplicación Delta Chat.</p>
<p>Enabling “Only Fetch from DeltaChat folder” makes sense if you have <strong>both</strong>:</p>
<ul>
<li>habilitó una regla del lado del servidor para mover todos los mensajes con el encabezado Chat-Version a la carpeta DeltaChat, y</li>
<li>ha configurado la opción “Mostrar correos clásicos” en “no, solo chats”.</li>
</ul>
<p>In this case, Delta Chat doesn’t need to watch the Inbox, and it’s enough to only watch the DeltaChat folder.</p>
<h3 id="how-can-i-change-my-account-to-a-different-e-mail-address">
How can I change my account to a different e-mail address? <a href="#how-can-i-change-my-account-to-a-different-e-mail-address" class="anchor"></a>
</h3>
<ol>
<li>
<p>Change your address in “Settings - Password and Account” and
enter the password of your new account (and if necessary, server settings).
You will get an information notice about the fact that you are moving to a new address.
An additional notice will also show up in your “Device messages” chat.</p>
</li>
<li>
<p>If possible, let your old e-mail provider forward all messages to your new address.</p>
</li>
<li>
<p>Tell your contacts that you changed your address.
Writing to guaranteed end-to-end encrypted chats and groups,
will make them notice your move automatically
and they will continue chatting with you using your new address.</p>
</li>
</ol>
<p>Note that Delta Chat will not retrieve messages anymore from your old e-mail provider.
If you didn’t configure your e-mail provider to forward messages (step 2.)
only those contacts to whom you sent a message in a guaranteed end-to-end encrypted chat
will send messages to your new address.</p>
<p>To learn more about this the details behind this, <a href="https://delta.chat/en/2022-09-14-aeap">read our blogpost on
it</a>.</p>
<h2 id="miscelaneo">
Miscelaneo <a href="#miscelaneo" class="anchor"></a>
</h2>
<h3 id="delta-chat-funciona-con-mi-proveedor-de-correo-electrónico">
¿Delta Chat funciona con <em>mi</em> proveedor de correo electrónico? <a href="#delta-chat-funciona-con-mi-proveedor-de-correo-electrónico" class="anchor"></a>
</h3>
<ul>
<li>Es muy probable que sí :)
Sin embargo, algunos proveedores necesitan opciones especiales para funcionar correctamente, ver <a href="https://providers.delta.chat">Descripción de proveedores</a></li>
</ul>
<h3 id="i-want-to-manage-my-own-e-mail-server-for-delta-chat-what-do-you-recommend">
I want to manage my own e-mail server for Delta Chat. What do you recommend? <a href="#i-want-to-manage-my-own-e-mail-server-for-delta-chat-what-do-you-recommend" class="anchor"></a>
</h3>
<ul>
<li>Most mail servers will work well. But what we personally recommend is a
combination of mailcow and mailadm, as described <a href="https://delta.chat/en/2023-01-27-upcoming-mail-server-workshops">in this
blogpost</a>.</li>
<li>You can find an <a href="https://delta.chat/es/serverguide">installation guide on our website</a>.</li>
</ul>
<h3 id="si-delta-chat-utiliza-el-correo-electrónico-es-realmente-una-aplicación-de-mensajería-instantánea">
Si Delta Chat utiliza el correo electrónico, ¿es realmente una aplicación de mensajería <em>instantánea</em>? <a href="#si-delta-chat-utiliza-el-correo-electrónico-es-realmente-una-aplicación-de-mensajería-instantánea" class="anchor"></a>
</h3>
<ul>
<li>Sending and receiving messages takes a few seconds, typically. Sometimes
there are cases where it takes longer but that is arguably true as well for
any other messenger.</li>
<li>Instant chatting works fast if both parties are actively using the app. It’s
sometimes slower if the app is running in the background.</li>
<li>Receiving messages then can take minutes because both Android and iOS often
stop Delta Chat from running in the background, and only wake it up
occasionally. This artificial delay is usually worse on iOS than on Android.</li>
<li>However, Android and iOS kill apps running in the background is a
problem for many legitimate apps. For more information, see
<a href="https://dontkillmyapp.com/">dontkillmyapp.com</a>.</li>
</ul>
<h3 id="delta-chat-es-compatible-con-protonmail--tutanota--criptext">
¿Delta Chat es compatible con Protonmail / Tutanota / Criptext? <a href="#delta-chat-es-compatible-con-protonmail--tutanota--criptext" class="anchor"></a>
</h3>
<ul>
<li>Yes and No.</li>
<li>No, you can not use your Protonmail, Tutanota, or Criptext account with Delta
Chat; they do not offer receiving mails via IMAP.</li>
<li>In any case you can use Delta Chat to send Messages to people who use
Protonmail, Tutanota, or Criptext. Those messages will not be end-to-end
encrypted, though. The end-to-end encryption those providers offer is not
compatible with <a href="https://autocrypt.org/">Autocrypt</a>, the standard Delta Chat
uses.</li>
<li>Delta Chat can end-to-end-encrypt through any e-mail provider with any
<a href="https://autocrypt.org/dev-status.html">Autocrypt-enabled e-mail app</a>.</li>
</ul>
<h3 id="estoy-interesado-en-los-detalles-técnicos-pueden-decirme-más">
Estoy interesado en los detalles técnicos. ¿Pueden decirme más? <a href="#estoy-interesado-en-los-detalles-técnicos-pueden-decirme-más" class="anchor"></a>
</h3>
<ul>
<li>Visita la página <a href="https://github.com/deltachat/deltachat-core-rust/blob/master/standards.md#standards-used-in-delta-chat">Estándares usados en Delta Chat</a>.</li>
</ul>
<h3 id="security-audits">
Was Delta Chat independently audited for security vulnerabilities? <a href="#security-audits" class="anchor"></a>
</h3>
<p>The Delta Chat project underwent four independent security audits in the last years:</p>
<ul>
<li>
<p>In 2019, <a href="https://includesecurity.com">Include Security</a> analyzed Delta
Chat’s <a href="https://github.com/rpgp/rpgp">PGP</a> and
<a href="https://github.com/RustCrypto/RSA">RSA</a> libraries.
It found no critical issues,
but two high-severity issues that we subsequently fixed.
It also revealed one medium-severity and some less severe issues,
but there was no way to exploit these vulnerabilities in the Delta Chat implementation.
Some of them we nevertheless fixed since the audit was concluded.
You can read the <a href="https://delta.chat/assets/blog/2019-first-security-review.pdf">full report here</a>.</p>
</li>
<li>
<p>In 2020, <a href="https://includesecurity.com">Include Security</a> analyzed Delta
Chat’s Rust <a href="https://github.com/deltachat/deltachat-core-rust/">core</a>,
<a href="https://github.com/async-email/async-imap">IMAP</a>,
<a href="https://github.com/async-email/async-smtp">SMTP</a>, and
<a href="https://github.com/async-email/async-native-tls">TLS</a> libraries.
It did not find any critical or high-severity issues.
The report raised a few medium-severity weaknesses -
they are no threat to Delta Chat users on their own
because they depend on the environment in which Delta Chat is used.
For usability and compatibility reasons,
we can not mitigate all of them
and decided to provide security recommendations to threatened users.
You can read the <a href="https://delta.chat/assets/blog/2020-second-security-review.pdf">full report here</a>.</p>
</li>
<li>
<p>Beginning 2023, <a href="https://cure53.de">Cure53</a> analyzed both the transport encryption of
Delta Chat’s network connections and a reproducible mail server setup as
<a href="https://delta.chat/es/serverguide">recommended on this site</a>.
You can read more about the audit <a href="https://delta.chat/en/2023-03-27-third-independent-security-audit">on our blog</a>
or read the <a href="https://delta.chat/assets/blog/MER-01-report.pdf">full report here</a>.</p>
</li>
<li>
<p>Beginning 2023, we fixed security and privacy issues with the “web
apps shared in a chat” feature, related to failures of sandboxing
especially with Chromium. We subsequently got an independent security
audit from Cure53 and all issues found were fixed in the 1.36 app series released in April 2023.
See <a href="https://delta.chat/en/2023-05-22-webxdc-security">here for the full background story on end-to-end security in the web</a>.</p>
</li>
</ul>
<h3 id="cómo-se-financia-el-desarrollo-de-delta-chat">
¿Cómo se financia el desarrollo de Delta Chat? <a href="#cómo-se-financia-el-desarrollo-de-delta-chat" class="anchor"></a>
</h3>
<p>Delta Chat does not receive any Venture Capital and
is not indebted, and under no pressure to produce huge profits, or to
sell users and their friends and family to advertisers (or worse).
We rather use public funding sources, so far from EU and US origins, to help
our efforts in instigating a decentralized and diverse chat messaging eco-system
based on Free and Open-Source community developments.</p>
<p>Concretely, Delta Chat developments have so far been funded from these sources:</p>
<ul>
<li>
<p>The <a href="https://nextleap.eu">NEXTLEAP</a> EU project funded the research
and implementation of verified groups and setup contact protocols
in 2017 and 2018 and also helped to integrate end-to-end Encryption
through <a href="https://autocrypt.org">Autocrypt</a>.</p>
</li>
<li>
<p>The <a href="https://opentechfund.org">Open Technology Fund</a> gave us a
first 2018/2019 grant (~$200K) during which we majorly improved the Android app
and released a first Desktop app beta version, and which moreover
moored our feature developments in UX research in human rights contexts,
see our concluding <a href="https://delta.chat/en/2019-07-19-uxreport">Needfinding and UX report</a>.
The second 2019/2020 grant (~$300K) helped us to
release Delta/iOS versions, to convert our core library to Rust, and
to provide new features for all platforms.</p>
</li>
<li>
<p>The <a href="https://nlnet.nl/">NLnet foundation</a> granted in 2019/2020 EUR 46K for
completing Rust/Python bindings and instigating a Chat-bot eco-system.</p>
</li>
<li>
<p>In 2021 we received further EU funding for two Next-Generation-Internet
proposals, namely for <a href="https://dapsi.ngi.eu/hall-of-fame/eppd/">EPPD - e-mail provider portability directory</a> (~97K EUR) and <a href="https://nlnet.nl/project/EmailPorting/">AEAP - email address porting</a> (~90K EUR) which resulted in better multi-account support, improved QR-code contact and group setups and many networking improvements on all platforms.</p>
</li>
<li>
<p>From End 2021 till March 2023 we received <em>Internet Freedom</em> funding (500K USD) from the
U.S. Bureau of Democracy, Human Rights and Labor (DRL).
This funding supported our long-running goals to make Delta Chat more usable
and compatible with a wide range of e-mail servers world-wide, and more resilient and secure
in places often affected by internet censorship and shutdowns.</p>
</li>
<li>
<p>Beginning 2023 we got accepted in the Next Generation Internet (NGI)
Entrust program for our “Private Decentralized Apps” proposals.
Exact amount is to be determined (around 100K EUR).
This funding supports further developments of <a href="https://webxdc.org">webxdc “apps shared in a chat”</a>.</p>
</li>
<li>
<p>Sometimes we receive one-time donations from private individuals.
For example, in 2021 a generous individual bank-wired us 4K EUR
with the subject “keep up the good developments!”. 💜
We use such money to fund development gatherings or to care for ad-hoc expenses
that can not easily be predicted for, or reimbursed from, public funding grants.
Receiving more donations also helps us to become more independent and long-term viable
as a contributor community.</p>
</li>
<li>
<p>Por último, pero no por ello menos importante, varios expertos pro-bono y entusiastas contribuyeron
y contribuyen a los desarrollos de Delta Chat sin recibir dinero, o sólo
pequeñas cantidades. Sin ellos, Delta Chat no estaría donde está hoy, ni
siquiera cerca.</p>
</li>
</ul>
<p>The monetary funding mentioned above is mostly organized by merlinux GmbH in
Freiburg (Germany), and is distributed to more than a dozen contributors world-wide.</p>
<p>Please see <a href="https://delta.chat/es/contribute">Delta Chat Contribution channels</a>
for both monetary and and other contribution possibilities.</p>
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