Delta Chat
@delta.chat
Secure decentralized messaging across all major platforms. Instant and reliable via fast chatmail relays, compatible with classic email providers. Features chat-shared […]
🌉 bridged from ⁂ https://chaos.social/@delta, follow @ap.brid.gy to interact
🌉 bridged from ⁂ https://chaos.social/@delta, follow @ap.brid.gy to interact
#deltachat breaks the one app, one ID rule of phone-number-based apps by supporting multiple chat profiles. This allows for true private messaging where you can keep a public identity for the Web or Fediverse separate from a private one for family and friends. Managing multiple selves is a new […]
Original post on chaos.social
chaos.social
February 10, 2026 at 4:22 PM
#deltachat breaks the one app, one ID rule of phone-number-based apps by supporting multiple chat profiles. This allows for true private messaging where you can keep a public identity for the Web or Fediverse separate from a private one for family and friends. Managing multiple selves is a new […]
The total privacy of #deltachat has a trade-off: there is no global directory. Connecting for private messaging requires a direct QR scan or using an existing channel to exchange invite links. The hurdle is often the readiness of friends, family, or those around you to switch. However, once […]
Original post on chaos.social
chaos.social
February 10, 2026 at 4:21 PM
The total privacy of #deltachat has a trade-off: there is no global directory. Connecting for private messaging requires a direct QR scan or using an existing channel to exchange invite links. The hurdle is often the readiness of friends, family, or those around you to switch. However, once […]
While platforms like #matrix or #signal manage user identities on a server, #deltachat and #Chatmail are not platforms in the classic sense. They operate without a central registry, meaning there is no central gatekeeper to grant or deny access. This setup for private messaging naturally […]
Original post on chaos.social
chaos.social
February 10, 2026 at 4:17 PM
While platforms like #matrix or #signal manage user identities on a server, #deltachat and #Chatmail are not platforms in the classic sense. They operate without a central registry, meaning there is no central gatekeeper to grant or deny access. This setup for private messaging naturally […]
The migration completed successfully, everything should be back to normal now.
February 10, 2026 at 11:55 AM
The migration completed successfully, everything should be back to normal now.
PSA: The default relay server nine.testrun.org will be down for 15-30 minutes for another migration starting 11:00 CET.
February 10, 2026 at 9:55 AM
PSA: The default relay server nine.testrun.org will be down for 15-30 minutes for another migration starting 11:00 CET.
We engage with decentralization protocols a lot (many nerds love to) but make no mistake: in the end, the app needs to work and be easy to use.
#deltachat is a cross-platform FOSS offering, with guaranteed security levels, close to user expectations ... major factors in driving adoption!
True […]
#deltachat is a cross-platform FOSS offering, with guaranteed security levels, close to user expectations ... major factors in driving adoption!
True […]
Original post on chaos.social
chaos.social
February 7, 2026 at 7:41 PM
We engage with decentralization protocols a lot (many nerds love to) but make no mistake: in the end, the app needs to work and be easy to use.
#deltachat is a cross-platform FOSS offering, with guaranteed security levels, close to user expectations ... major factors in driving adoption!
True […]
#deltachat is a cross-platform FOSS offering, with guaranteed security levels, close to user expectations ... major factors in driving adoption!
True […]
It took a while but it's shaping up nicely :) Post-Quantum Cryptography and Reliable Deletion, better known as Forward Secrecy, are going to become available in 2026 in #deltachat. For more details, including the recent #fosdem26 talk recording:
https://autocrypt2.org
https://autocrypt2.org
Autocrypt v2 - Post-Quantum and Reliable Deletion
Modern OpenPGP v6 certificate with post-quantum cryptography, reliable deletion, and transport-agnostic messaging for decentralized systems.
autocrypt2.org
February 6, 2026 at 12:52 AM
It took a while but it's shaping up nicely :) Post-Quantum Cryptography and Reliable Deletion, better known as Forward Secrecy, are going to become available in 2026 in #deltachat. For more details, including the recent #fosdem26 talk recording:
https://autocrypt2.org
https://autocrypt2.org
A lot of messaging systems try to reinvent the email system but many (signal, matrix, xmpp) took over one key traditional design which we actually dropped while retaining SMTP/IMAP compatibility: server-controlled identities.
With #chatmail user identities are cryptographic and reside on end […]
With #chatmail user identities are cryptographic and reside on end […]
Original post on chaos.social
chaos.social
February 4, 2026 at 9:47 PM
A lot of messaging systems try to reinvent the email system but many (signal, matrix, xmpp) took over one key traditional design which we actually dropped while retaining SMTP/IMAP compatibility: server-controlled identities.
With #chatmail user identities are cryptographic and reside on end […]
With #chatmail user identities are cryptographic and reside on end […]
Our second #fosdem talk is about to start: Hocuri talks about the upcoming #multirelay profiles, which use more than one address to exchange messages!
Live Stream is here:
https://live.fosdem.org/watch/ud2218a
Live Stream is here:
https://live.fosdem.org/watch/ud2218a
FOSDEM 2026 - Stream UD2.218A
live.fosdem.org
February 1, 2026 at 3:32 PM
Our second #fosdem talk is about to start: Hocuri talks about the upcoming #multirelay profiles, which use more than one address to exchange messages!
Live Stream is here:
https://live.fosdem.org/watch/ud2218a
Live Stream is here:
https://live.fosdem.org/watch/ud2218a
@liaizon @matrix @swf @Bonfire @xmpp fwiw some of us just launched autocrypt2 today, a new transport-independent e2e scheme to do PQC and reliable deletion (forward secrecy), based on clock based instead of message based key ratcheting […]
Original post on chaos.social
chaos.social
January 31, 2026 at 10:43 PM
Ever wondering where the QR codes in #deltachat come from? each of them is handmade, as everything in delta :) #fosdem
January 31, 2026 at 5:53 PM
Ever wondering where the QR codes in #deltachat come from? each of them is handmade, as everything in delta :) #fosdem
Now in the #fosdem live stream: Holger Krekel introducing #autocrypt2, a mechanism to protect against store-now-decrypt-later attacks, to be introduced in Delta!
https://live.fosdem.org/watch/k4201
More details about the talk […]
https://live.fosdem.org/watch/k4201
More details about the talk […]
Original post on chaos.social
chaos.social
January 31, 2026 at 12:17 PM
Now in the #fosdem live stream: Holger Krekel introducing #autocrypt2, a mechanism to protect against store-now-decrypt-later attacks, to be introduced in Delta!
https://live.fosdem.org/watch/k4201
More details about the talk […]
https://live.fosdem.org/watch/k4201
More details about the talk […]
Several of our teams will be at #fosdem26 ... we'll introduce our PQC and Reliable Deletion ("forward secrecy") efforts, and give an overview over multi-relay #chatmail architectures. Or catch us on the booth or some sunny place outside :)
https://delta.chat/fosdem26.html
invite link for […]
https://delta.chat/fosdem26.html
invite link for […]
Original post on chaos.social
chaos.social
January 30, 2026 at 12:17 PM
Several of our teams will be at #fosdem26 ... we'll introduce our PQC and Reliable Deletion ("forward secrecy") efforts, and give an overview over multi-relay #chatmail architectures. Or catch us on the booth or some sunny place outside :)
https://delta.chat/fosdem26.html
invite link for […]
https://delta.chat/fosdem26.html
invite link for […]
@tizianomattei @keverets
There are already more relays,
https://chatmail.at/relays lists some of them. This page is reachable through the "Use other server" option during profile creation. At the end of the page there is a link to https://chatmail.at/doc/relay/ with the documentation on setting […]
There are already more relays,
https://chatmail.at/relays lists some of them. This page is reachable through the "Use other server" option during profile creation. At the end of the page there is a link to https://chatmail.at/doc/relay/ with the documentation on setting […]
Original post on chaos.social
chaos.social
January 30, 2026 at 8:59 AM
@tizianomattei @keverets
There are already more relays,
https://chatmail.at/relays lists some of them. This page is reachable through the "Use other server" option during profile creation. At the end of the page there is a link to https://chatmail.at/doc/relay/ with the documentation on setting […]
There are already more relays,
https://chatmail.at/relays lists some of them. This page is reachable through the "Use other server" option during profile creation. At the end of the page there is a link to https://chatmail.at/doc/relay/ with the documentation on setting […]
@keverets Tap Create new profile -> Use other server -> Use classic email as relay, there you can enter email credentials of your own server.
January 30, 2026 at 3:35 AM
@keverets Tap Create new profile -> Use other server -> Use classic email as relay, there you can enter email credentials of your own server.
If you want to do a fun thing this weekend, maybe write a little webxdc app for your family or friends chats? There are many to fork from, see https://webxdc.org/apps and for development docs https://webxdc.org/docs
And for development tooling
https://GitHub.com/webxdc/webxdc-dev which simulates […]
And for development tooling
https://GitHub.com/webxdc/webxdc-dev which simulates […]
Original post on chaos.social
chaos.social
January 16, 2026 at 9:56 AM
If you want to do a fun thing this weekend, maybe write a little webxdc app for your family or friends chats? There are many to fork from, see https://webxdc.org/apps and for development docs https://webxdc.org/docs
And for development tooling
https://GitHub.com/webxdc/webxdc-dev which simulates […]
And for development tooling
https://GitHub.com/webxdc/webxdc-dev which simulates […]
#deltachat does
- no bindings to public handles/numbers
- no address-book upload
- not do public contact or group discovery
- not have critical persistent server state (!)
Social identification is private, between people though ephemeral #p2p #e2ee messages.
Servers see messages with […]
- no bindings to public handles/numbers
- no address-book upload
- not do public contact or group discovery
- not have critical persistent server state (!)
Social identification is private, between people though ephemeral #p2p #e2ee messages.
Servers see messages with […]
Original post on chaos.social
chaos.social
January 14, 2026 at 12:18 AM
#deltachat does
- no bindings to public handles/numbers
- no address-book upload
- not do public contact or group discovery
- not have critical persistent server state (!)
Social identification is private, between people though ephemeral #p2p #e2ee messages.
Servers see messages with […]
- no bindings to public handles/numbers
- no address-book upload
- not do public contact or group discovery
- not have critical persistent server state (!)
Social identification is private, between people though ephemeral #p2p #e2ee messages.
Servers see messages with […]
PSA We are happy about the wealth of privacy focused classic email providers (proton, tutanota, posteo, mailbox.org etc) but they are not geared for instant secure messaging. Do yourself, family and friends a favor and use delta with any of the many https://chatmail.at/relays
Or setup a relay […]
Or setup a relay […]
Original post on chaos.social
chaos.social
January 10, 2026 at 2:31 PM
PSA We are happy about the wealth of privacy focused classic email providers (proton, tutanota, posteo, mailbox.org etc) but they are not geared for instant secure messaging. Do yourself, family and friends a favor and use delta with any of the many https://chatmail.at/relays
Or setup a relay […]
Or setup a relay […]
Our stance simplified: we want to make private communications available to anyone on the planet.
Problem: governments everywhere tend to want to control and contain private communications. While Iran and Russia might be contemporary poster examples trying to control private communication […]
Problem: governments everywhere tend to want to control and contain private communications. While Iran and Russia might be contemporary poster examples trying to control private communication […]
Original post on chaos.social
chaos.social
January 9, 2026 at 8:07 PM
Our stance simplified: we want to make private communications available to anyone on the planet.
Problem: governments everywhere tend to want to control and contain private communications. While Iran and Russia might be contemporary poster examples trying to control private communication […]
Problem: governments everywhere tend to want to control and contain private communications. While Iran and Russia might be contemporary poster examples trying to control private communication […]
several people reporting lately that #deltachat has become their main app: They are now spending more time in the chats, also with web apps, than in any other app. It may be a turn to more private communications when social media has become more toxic, obnoxious and dangerous in many places? […]
Original post on chaos.social
chaos.social
January 7, 2026 at 1:22 AM
several people reporting lately that #deltachat has become their main app: They are now spending more time in the chats, also with web apps, than in any other app. It may be a turn to more private communications when social media has become more toxic, obnoxious and dangerous in many places? […]
We are looking for an experienced Android UI developer for https://github.com/deltachat/deltachat-android. Native Java, close to the system, with minimal deps and fluff.
Networking/encryption/persistence is not part of the job as it happens in https://github.com/chatmail/core
Remote collab is […]
Networking/encryption/persistence is not part of the job as it happens in https://github.com/chatmail/core
Remote collab is […]
Original post on chaos.social
chaos.social
January 5, 2026 at 8:12 PM
We are looking for an experienced Android UI developer for https://github.com/deltachat/deltachat-android. Native Java, close to the system, with minimal deps and fluff.
Networking/encryption/persistence is not part of the job as it happens in https://github.com/chatmail/core
Remote collab is […]
Networking/encryption/persistence is not part of the job as it happens in https://github.com/chatmail/core
Remote collab is […]
Don't believe those who loudly claim email can not avoid metadata! They are ignorant of our continuous works on minimizing metadata:
DONE:
- no phone number other identifying data needed
- no cleartext "Subject"
- no cleartext "To"
- randomized "Date"
- no IP addresses
- […]
DONE:
- no phone number other identifying data needed
- no cleartext "Subject"
- no cleartext "To"
- randomized "Date"
- no IP addresses
- […]
Original post on chaos.social
chaos.social
January 5, 2026 at 12:18 PM
Don't believe those who loudly claim email can not avoid metadata! They are ignorant of our continuous works on minimizing metadata:
DONE:
- no phone number other identifying data needed
- no cleartext "Subject"
- no cleartext "To"
- randomized "Date"
- no IP addresses
- […]
DONE:
- no phone number other identifying data needed
- no cleartext "Subject"
- no cleartext "To"
- randomized "Date"
- no IP addresses
- […]
It's true: the more technical background and pre-conceptions you have, the more more likely you run into trouble with #deltachat 😂
Don't think so much! 😉
Don't think so much! 😉
December 30, 2025 at 7:50 PM
It's true: the more technical background and pre-conceptions you have, the more more likely you run into trouble with #deltachat 😂
Don't think so much! 😉
Don't think so much! 😉
#39c3 .ending .. quite an enjoyable blast, and thanks to all the wonderful people just dropping by to say "thank you, it all works very nice for us"! 🥰 Certainly raised team spirits :)
This year around, apart from one #chatmail relay setup workshop we didn't do […]
[Original post on chaos.social]
This year around, apart from one #chatmail relay setup workshop we didn't do […]
[Original post on chaos.social]
December 30, 2025 at 5:11 PM
#39c3 .ending .. quite an enjoyable blast, and thanks to all the wonderful people just dropping by to say "thank you, it all works very nice for us"! 🥰 Certainly raised team spirits :)
This year around, apart from one #chatmail relay setup workshop we didn't do […]
[Original post on chaos.social]
This year around, apart from one #chatmail relay setup workshop we didn't do […]
[Original post on chaos.social]
@babble_endanger If you use only a single device, then messages are immediately removed after download. If you have multiple devices, messages stay longer so that all devices get a chance to get the messages. But all messages are still removed unconditionally after 20 days (configurable by relay […]
Original post on chaos.social
chaos.social
December 30, 2025 at 9:41 AM
@babble_endanger If you use only a single device, then messages are immediately removed after download. If you have multiple devices, messages stay longer so that all devices get a chance to get the messages. But all messages are still removed unconditionally after 20 days (configurable by relay […]