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The backend is: EMAIL! :) It uses SMTP/IMAP to propagate and store individual messages. This means that DeltaChat it will work with your usual email account (i

The backend is: EMAIL! :) It uses SMTP/IMAP to propagate and store individual messages. This means that DeltaChat it will work with your usual email account (it will create an IMAP folder named DeltaChat), but if you install the app and say “Yeah, just let me in!”, it will create a random username for you on one of its own chatmail servers. It may sound like a bad thing to use email, but it works very, very well. Most people won't even notice. See e.g.: https://delta.chat/en/chatmail https://delta.chat/en/chatmail https://providers.delta.chat/ https://providers.delta.chat/

raybb 1y ago
Last time I tried delta chat they didn't have chatmail so this is new to me. Kinda surprised to find this on privacy policy of the default chatmail instance: > unconditionally removes messages after 20 days Didn't see any warning about this in the GUI or the chatmail page. Does this mean after 20 days the messages on my app will disappear? or just they'll only be available on my local app after that point? In any case, that's a pretty big red flag that it's not clear.
- pepa65 1y ago
  So if you don't use the app for more than 20 days, you'll start to lose your oldest messages (that you haven't downloaded to your device yet).
- gardenerik 1y ago
  It is deleted from the server only, it stays on your devices, and is also synced to new device when you add one.
  - raybb 1y ago
    Where did you see this? Or just learned from experience?
    - kseistrup 1y ago
      FAQ: What happens if I turn on “Delete old messages from server”? https://delta.chat/en/help#what-happens-if-i-turn-on-delete-old-messages-from-server https://delta.chat/en/help#what-happens-if-i-turn-on-delete-...
    - gardenerik 1y ago
      Cannot find it now, but that's how it was discussed at the time when chatmail server became a thing. It is also how it is configured in chatmail: https://github.com/chatmail/relay/blob/96a1dbac08441034c5990579edd12aa4801cb058/cmdeploy/src/cmdeploy/dovecot/expunge.cron.j2#L3 https://github.com/chatmail/relay/blob/96a1dbac08441034c5990... https://github.com/chatmail/relay/blob/96a1dbac08441034c5990579edd12aa4801cb058/chatmaild/src/chatmaild/ini/chatmail.ini.f#L24 https://github.com/chatmail/relay/blob/96a1dbac08441034c5990... You obviously must trust that the server runs this configuration, but you can always run your own chatmail, or regular postfix. (If you don't need "federation" with other mail servers, you don't even need port 25 open). However, you can also configure your app to delete messages from the server sooner.
      - kseistrup 1y ago
        The FAQ reads: »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.« https://delta.chat/en/help#what-happens-if-i-turn-on-delete-old-messages-from-server https://delta.chat/en/help#what-happens-if-i-turn-on-delete-...
- kseistrup 1y ago
  AFAIK, the downloaded messages are not deleted from your app.

raybb 1y ago

Last time I tried delta chat they didn't have chatmail so this is new to me. Kinda surprised to find this on privacy policy of the default chatmail instance: > unconditionally removes messages after 20 days Didn't see any warning about this in the GUI or the chatmail page. Does this mean after 20 days the messages on my app will disappear? or just they'll only be available on my local app after that point? In any case, that's a pretty big red flag that it's not clear.

pepa65 1y ago
So if you don't use the app for more than 20 days, you'll start to lose your oldest messages (that you haven't downloaded to your device yet).
gardenerik 1y ago
It is deleted from the server only, it stays on your devices, and is also synced to new device when you add one.
- raybb 1y ago
  Where did you see this? Or just learned from experience?
  - kseistrup 1y ago
    FAQ: What happens if I turn on “Delete old messages from server”? https://delta.chat/en/help#what-happens-if-i-turn-on-delete-old-messages-from-server https://delta.chat/en/help#what-happens-if-i-turn-on-delete-...
  - gardenerik 1y ago
    Cannot find it now, but that's how it was discussed at the time when chatmail server became a thing. It is also how it is configured in chatmail: https://github.com/chatmail/relay/blob/96a1dbac08441034c5990579edd12aa4801cb058/cmdeploy/src/cmdeploy/dovecot/expunge.cron.j2#L3 https://github.com/chatmail/relay/blob/96a1dbac08441034c5990... https://github.com/chatmail/relay/blob/96a1dbac08441034c5990579edd12aa4801cb058/chatmaild/src/chatmaild/ini/chatmail.ini.f#L24 https://github.com/chatmail/relay/blob/96a1dbac08441034c5990... You obviously must trust that the server runs this configuration, but you can always run your own chatmail, or regular postfix. (If you don't need "federation" with other mail servers, you don't even need port 25 open). However, you can also configure your app to delete messages from the server sooner.
    - kseistrup 1y ago
      The FAQ reads: »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.« https://delta.chat/en/help#what-happens-if-i-turn-on-delete-old-messages-from-server https://delta.chat/en/help#what-happens-if-i-turn-on-delete-...
kseistrup 1y ago
AFAIK, the downloaded messages are not deleted from your app.