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Delta Chatdelta@chaos.social
May 26, 2026, 9:31 PM
Reminder: There are no accounts in the classic sense anywhere with #chatmail or #deltachat.
It's all private profiles on end user devices which co-ordinate in a #p2p fashion. Chat profiles *use* email (relay) addresses for transporting messages through a federated e2ee-restricted SMTP network.
A chat profile or chat group has zero data on the server. It's radically different from classic email servers, Whatsapp, Signal, XMPP and Matrix servers which host and control chat identity.
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Replies

Taeltael@yiff.life
May 26, 2026, 10:39 PM
@delta so what's different between this and https://tox.chat/?
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Delta Chatdelta@chaos.social
May 26, 2026, 11:32 PM
@tael
we can't offer a full comparison but here are three key points:
1. Tox is not a cross-platform user offering like #deltachat, but more an infrastructure library like https://github.com/chatmail/core
2. Tox can only transfer messages between contacts who are online at the same time. complicates mobile usage.
3. Tox depends on a global distributed hash table (DHT) to find other contacts; doesn't work in highly restricted networks like during national internet shutdowns/larger failures etc.
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Aleksandr Koltsoffnihkeys@mastodontti.fi
May 27, 2026, 6:36 AM
@delta Is there a technical architectural document about the system somewhere? I've tried finding one already couple of times but search engines are not liking my queries for this.
A self-contained blog article would be also fine 🙂
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Delta Chatdelta@chaos.social
May 27, 2026, 6:51 AM
@nihkeys There is documentation about various areas of the project, what exactly are you looking for? https://cosmos.delta.chat/ gives an overview about the components of the ecosystem. We also plan to publish a security whitepaper later this year, if that's your angle.
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eltheanineeltheanine@the.teabag.ninja
Jun 14, 2026, 10:21 PM
What happens if you change the email address you use then...?
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Delta Chatdelta@chaos.social
Jun 14, 2026, 11:08 PM
@eltheanine you can add a "relay" (another email server) and then phase out the old one, thereby migrating. See https://delta.chat/en/help#relays and https://delta.chat/en/2026-03-31-zero#maximizing-availability-and-resilience-through-multi-path-delivery
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Wechoxwechox@wxw.moe
Jun 21, 2026, 7:35 AM
@delta I was wondering, when I add or change relays and then send messages to my friends, will the system inform them of all the relays I’m using, or only the specific relay through which the message is actually sent?
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Delta Chatdelta@chaos.social
Jun 21, 2026, 8:54 AM
@wechox your chat contacts will get your changes in any next message you send them (including "read receipts"). Additionally group chat members gossip about each others latest relay setup.
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