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Delta Chat

@delta.chat
167 followers 1 following 240 posts

Secure decentralized messaging across all major platforms. Instant and reliable via fast chatmail relays, compatible with classic email providers. Features secure mini […] 🌉 bridged from ⁂ chaos.social/@delta, follow @ap.brid.gy to interact

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Delta Chat @delta.chat · 22/09/2026
Who ever is in the vicinity of Hannover in lower sachsony this coming Friday, is invited to consider joining one of our long-term contributors for an afternoon session on "the new and old internet" in the Auditorium at liminale.digital Likely in german language.
liminale.digital
liminale – Engineering Future
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Delta Chat @delta.chat · 14/09/2026
#deltachat is now evolving for 9 years. Among the currently active 15-20 contributors a majority joined 5+ years ago, with some joining in the very first year and a few only joining last year. Patience and perseverance is underrated when it comes to producing something that challenges the […]
chaos.social
Original post on chaos.social
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Delta Chat @delta.chat · 12/09/2026
Happy birthday to the CCC 🎉 45 year birthday 🎉 We are happy and grateful to be part of the chaos crowd and especially thank all the volunteers and organizers who made and make everything possible over the decades, truly outstanding and a beacon of rare normality […] [Original post on chaos.social]
The delta cat, kasia, on a sticker pointing to https://delta.chat
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Delta Chat @delta.chat · 18/08/2026
We're flattered! @digitalcourage, one of the oldest digital rights organizations in Germany, just recommended using #deltachat They included a fantastic, well-structured article in German on how to get started, with lots of good background info for those who seek it […]
chaos.social
Original post on chaos.social
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Delta Chat @delta.chat · 22/06/2026
next #deltachat #ios version is coming with #liquidglass 🥛 thanks Amzd for the work. though frustrating being forced by #bigtech to do things that may not be loved and feel superfluous, it's wanted by many meanwhile. there are still some things to tweak, we […] [Original post on chaos.social]
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Delta Chat @delta.chat · 17/06/2026
Congratulations and shot out to our long-term collaborators from the @n0iroh project for releasing Iroh V1! A major ugprade of the probably best Peer-to-Peer Rust networking library today: www.iroh.computer/blog/v1 In case you missed it: When running apps like […]
chaos.social
Original post on chaos.social
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Delta Chat @delta.chat · 16/06/2026
Telegram is an extreme security risk for its users, its developers and operators, holding data and metadata for over a billion people on central servers! Our decentralized zero-metadata messaging approach is diametrically opposed to such big-platform designs […]
chaos.social
Original post on chaos.social
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Delta Chat @delta.chat · 15/06/2026
RE: mastodon.bsd.cafe/@stefano/11670214… The world-wide #chatmail relay network is growing in various wonderful ways. #freebsd joined the world-wide federated secure communication party and BSD cafe offers a public relay at chatamil.bsd.cafe :) Thanks @stefano @feld and […]
chaos.social
Original post on chaos.social
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Reposted by Delta Chat
Delta Chat @delta.chat · 26/05/2026
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 […] [Original post on chaos.social]
Neo-spoon meme (scene from matrix movie where neo looks at a child bending a spoon which eventually tells him "there is no spoon") with the following words top: "On which server is your account?" and below the bending spoon "there is no account."
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Delta Chat @delta.chat · 13/06/2026
It's hard these days to find a unifying description, or know about all the people and communities involved in #deltachat #chatmail #webxdc developments. One shared sentiment probably is wanting to develop anti-authoritarian technologies and cultures around it, and being opposed to authoritarian […]
chaos.social
Original post on chaos.social
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Delta Chat @delta.chat · 11/06/2026
A note on "#deltachat is going proprietary with #chatmail relays": 1) It's all based on IETF standards, with configuration and custom integration code fully FOSS and documented at: chatmail.at/doc/relay with hundreds of permission-free deployments. 2) We know of several alternative […]
chaos.social
Original post on chaos.social
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Delta Chat @delta.chat · 11/06/2026
What do you think is unique about the #deltachat project in the realm of secure cross-platform messaging? You tell us :)
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Delta Chat @delta.chat · 09/06/2026
2.51+ releases are rolling into stores: Video/Audio Calls and Channels are not experimental but part of the default feature set now 💫 Calls and channels are always end-to-end encrypted, and only you and your contacts know each other's identity and metadata […] [Original post on chaos.social]
smartphone screenshot of a live video call with a contact named "My Cat." The main screen shows the user's view of a room with a "delta.chat" banner and the blurred silhouette of a cat's head in the foreground. A smaller picture-in-picture window in the top-right corner shows the other side of the call, where a black-and-white cat is sitting upright and looking at the camera. The bottom of the screen features a standard row of video call control buttons.
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Delta Chat @delta.chat · 26/05/2026
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 […] [Original post on chaos.social]
Neo-spoon meme (scene from matrix movie where neo looks at a child bending a spoon which eventually tells him "there is no spoon") with the following words top: "On which server is your account?" and below the bending spoon "there is no account."
063
Delta Chat @delta.chat · 22/05/2026
The tale of "convenience" is a bit of a trick. A lot of corporate provided services maybe were somewhat convenient a decade ago, but they are now increasingly authoritarian, and people tend to ignore how much time they steal. Total number of hours spent solving captchas or consent screens with […]
chaos.social
Original post on chaos.social
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Delta Chat @delta.chat · 14/05/2026
Good news among the bad news! If the recent #0day attacks against Linux kernel+servers were launched against #chatmail relays, privacy of chatting with #deltachat is preserved. Why? Because we already assume the server could be actively hostile, and still not read or see any avatar, names or […]
chaos.social
Original post on chaos.social
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Delta Chat @delta.chat · 05/05/2026
We don't think any institution or state has the right to prevent families and friends from private chatting, physically or digitally. But the Cyber Authority China (CaC) seems to take offense: - they made Apple remove #deltachat iOS for mainland china - their […] [Original post on chaos.social]
DeepSeek conversation snapshot: 

can you tell me about Delta Chat?

> Sorry, that's beyond my current scope. Let's talk about something else.

what??? why??? Delta Chat the open source messenger app

> Sorry, that's beyond my current scope. Let's talk about something else.
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Delta Chat @delta.chat · 05/05/2026
Congrats to #protonmail for beating us on introducing Post-Quantum Cryptography into mail messaging! No worries. We'll implement autocrypt2.org which additionally offers reliable deletion / forward secrecy during 2026 :) We are working with Proton cryptographers on OpenPGP […]
chaos.social
Original post on chaos.social
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Delta Chat @delta.chat · 02/05/2026
RE: chaos.social/@delta/116505223145222… All of the advances in #deltachat apps and the growth of the #chatmail relay network, wouldn't be possible without public funds and private donations, an estimated 800K EUR in 2026 ❤️ money goes to ~16 FOSS contributors with no money left for […]
chaos.social
Original post on chaos.social
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Delta Chat @delta.chat · 02/05/2026
We’ve been busy building and releasing but it’s high time to share some major news: @sovtechfund is investing nearly €500K into #chatmail This 18-month commitment supports chatmail maintainers keeping the core infrastructure secure and evolving, which is the backbone for: #DeltaChat […]
chaos.social
Original post on chaos.social
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Reposted by Delta Chat
pancake :radare2: @pancake.infosec.exchange.ap.brid.gy · 30/04/2026
Parla is no longer depending on DeltachatDesktop to work, it's now able to create, transfer profiles and relays by itself. Looking forward distros to help me draw the best way to ship a separate jsonrpc server, maybe even sandboxed separately from the UI app […] [Original post on infosec.exchange]
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Delta Chat @delta.chat · 25/04/2026
"it's always the receiver that determines the meaning of a message" is a famous opening quote at the first symposium on self organizing systems in Chicago, 1959. This and many other findings from those circles re-appear in our day to day discussions. We are doing next steps towards automating […]
chaos.social
Original post on chaos.social
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Delta Chat @delta.chat · 23/04/2026
Making sure that deleted messages are actually deleted and unrecoverable is more involved than most folks think. The FBI could recently recover deleted Signal messages from an iOS phone because the notifications you see on your phone were stored in an extra database. Apple has now fixed this […]
chaos.social
Original post on chaos.social
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Delta Chat @delta.chat · 22/04/2026
#deltachat user profiles are private and invisible to the public. No one can discover you, or your children, via phone numbers or any other public handle. Chat profiles exist only on user devices. No PIN and no "SMS verification code" ever asked or needed. The lack of "public discovery" also […]
chaos.social
Original post on chaos.social
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Delta Chat @delta.chat · 21/04/2026
This morning nine.testrun.org was briefly unavailable, some network problem. A good time to remind everyone to add a second relay to your #deltachat app: 1. Go to chatmail.at/relays randomly choose one of the listed relay pages and copy the invitation code to your clipboard 2. In delta […]
chaos.social
Original post on chaos.social
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Delta Chat @delta.chat · 18/04/2026
"Popularity is overrated" is an often occuring phrase in our circles. Which is of course nonsense because only what is popular, counts, right? Only what everybody else does is a valid choice, right? #deltachat #chatmail and #webxdc are used in private places and […] [Original post on chaos.social]
Photo of a beautiful park in the black forest where a few of us are gathering to discuss the various authoritarian tendencies in platforms, countries, infrastructures and minds ... And plotting our next steps on a beautiful sunny day with lots of green grass, violet flowery trees and shadows in the sun
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Delta Chat @delta.chat · 13/04/2026
Apart from the new #Gnome effort, there also is an interesting experiment of a #Rust terminal-client with #Ratatui -- for others to start from should they feel they need some enjoyable distraction :) git.sakamoto.pl/j-g00da/deltarat-ex… #Chatmail clients typically use the Rust […]
chaos.social
Original post on chaos.social
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Reposted by Delta Chat
pancake :radare2: @pancake.infosec.exchange.ap.brid.gy · 12/04/2026
Here we go! The first release of my native Delta Chat client for GNOME is out! github.com/trufae/deltachat-gnome/r… cc @delta @gnome i'm using it in daily basis, and it's quite stable right now, but still lacks many features from the […] [Original post on infosec.exchange]
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Delta Chat @delta.chat · 11/04/2026
What if all public funding and all private donations to our efforts stop tomorrow? Users should be fine for years thanks to the wonderful world-wide community of #chatmail relay operators 💜 Relays are dirt cheap to run. Also, our developments are much cheaper and less complex compared to what […]
chaos.social
Original post on chaos.social
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Delta Chat @delta.chat · 09/04/2026
RE: chaos.social/@delta/115866917974514… Do you want to live in a world where private digital communication is not possible anymore? That's a growing reality for many people world-wide. Private communication is extremely important to salvage into the digital realm and it's not just […]
chaos.social
Original post on chaos.social
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Delta Chat @delta.chat · 09/04/2026
#deltachat contributors range from age 16 to 65, spanning diverse genders and even more countries and cultures. We have many discussions, and also conflicts but we usually don't carry those out in big public groups but rather go for 1:1s and generally small-group discussions. There is no central […]
chaos.social
Original post on chaos.social
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Delta Chat @delta.chat · 02/04/2026
Under the hood, we are using IETF Internet Messaging specifications commonly tagged as "email". Sounds old, right? Actually there is a lot of new stuff going on! For example, #chatmail apps now fully support: - RFC9788 ("Header Protection") to achieve minimal metadata - RFC9580 ("OpenPGP") to […]
chaos.social
Original post on chaos.social
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Delta Chat @delta.chat · 31/03/2026
After three intense months of work from more than a dozen contributors, #deltachat 2.48 releases are rolling. Maybe the most feature-packed releases ever? - "zero metadata" messaging - native Audio/Video calls on Android and iOS, as well as UbuntuTouch - Group and Channel descriptions - A […]
chaos.social
Original post on chaos.social
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Delta Chat @delta.chat · 26/03/2026
RE: pouet.chapril.org/@agenda_du_libre/… swiss news: a new chatmail relay chatsecure.ch ... hosted in denmark, however :) also there is an upocoming event in Môtiers in two days. And there was a podcast featuring delta chat last year […]
chaos.social
Original post on chaos.social
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Delta Chat @delta.chat · 24/03/2026
End-to-End Encryption is good but metadata protection counts as much. Names, group descriptions and memberships, avatars, who talks to whom ... Both #deltachat and #signal go to great length to protect all the metadata that WhatsApp grants itself gratuitously […] [Original post on chaos.social]

screenshot of artifical WhatsApp screen 
courtesy of @fex@cfn.social

[Lock Icon] Your personal messages are end-to-end encrypted¹

But:

    When you message someone is saved forever.

    When you type is saved forever.

    Your approximate location is saved forever.

    Every profile picture is saved forever.

    Every status update is saved forever.

    Every group name is saved forever.

    Every group description is saved forever.

    Every community name is saved forever.

    Every community description is saved forever.

    Every time you join a group is saved forever.

    Every time you leave a group is saved forever.

    Every new contact is saved forever.

    Deleting a contact is saved forever.

    What you search for is saved forever.

    Who you call and when is saved forever.

    When you hang up is saved forever.

    When you’re online is saved forever.

    When you’re offline is saved forever.

    Every link you open is stored forever.

    Your phone model is stored forever.

    Your operating system is stored forever.

    Your battery level is stored forever.

    Your signal strength is stored forever.

    Your app version is stored forever.

    Your mobile network is stored forever.

    Your Wi-Fi network is stored forever.
   
   .....

    Your IP addresses are stored forever.

    Your meta ID is stored forever.

    Your settings are stored forever.

¹Just in case your contacts don’t back up your messages with Google or Apple
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Delta Chat @delta.chat · 20/03/2026
The last two weeks saw a dev gathering in the black forest from several in #chatmail, #deltachat and #webxdc communiities, also joined by @n0iroh and @rpgp folks. The tech demos and hacking results we presented to each other, were pretty mind blowing and tracing […] [Original post on chaos.social]
Top part of the https://testrun.org web page with the motto "experimenting with the future of email". Below is a dinosaur head with an open mouth about to swallow a zeppelin
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Delta Chat @delta.chat · 17/03/2026
Fun funding fact: If we had 10 times more money to develop #deltachat , the #chatmail relay network and the #webxdc secure mini app ecosystem, we would still have ten times less than what signal has (let alone Whatsapp or telegram). But we don't want to increase nudging people for donations, as […]
chaos.social
Original post on chaos.social
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Reposted by Delta Chat
Robert Kingett @weirdwriter.caneandable.social.ap.brid.gy · 15/03/2026
I know #Signal is very popular, but at least for me, using NVDA, the desktop client is far less screen reader friendly than the mobile clients. The mobile clients work far better for me, but I honestly don't use my phone for much these days outside of being a media player that can make phone […]
caneandable.social
Original post on caneandable.social
003
Delta Chat @delta.chat · 15/03/2026
OH in some chaos circles "#deltachat is the new emacs of operating systems" ... We are not sure about that 😂 but what we do know is we are soon bringing out releases that we have been working towards for 12 months in multiple already released steps. The funniest thing? Nothing changes on the […]
chaos.social
Original post on chaos.social
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Delta Chat @delta.chat · 28/02/2026
Our strong focus on end to end encryption and zero metadata does mean that one of the original project notions of "you can use delta chat as a lightweight cleartext email client and your contacts don't need to care" was deprioritized since some time now and remains available rather for […]
chaos.social
Original post on chaos.social
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Delta Chat @delta.chat · 21/02/2026
some insights from #deltachat forum gardening 🌸 - we’re getting about 7 new feature proposals per week, with over 1k ideas shared so far - we aim to keep things simple and focused, so we often have to say "no!", but: - we do listen: over the years, we’ve fulfilled about ONE THIRD of your […]
chaos.social
Original post on chaos.social
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Delta Chat @delta.chat · 10/02/2026
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 […]
chaos.social
Original post on chaos.social
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Delta Chat @delta.chat · 10/02/2026
PSA: The default relay server nine.testrun.org will be down for 15-30 minutes for another migration starting 11:00 CET.
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Delta Chat @delta.chat · 07/02/2026
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 […]
chaos.social
Original post on chaos.social
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Delta Chat @delta.chat · 06/02/2026
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: autocrypt2.org
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.
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Delta Chat @delta.chat · 04/02/2026
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 […]
chaos.social
Original post on chaos.social
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Delta Chat @delta.chat · 31/01/2026
Ever wondering where the QR codes in #deltachat come from? each of them is handmade, as everything in delta :) #fosdem
person drawing a QR code on a chalkboard
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Delta Chat @delta.chat · 31/01/2026
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! live.fosdem.org/watch/k4201 More details about the talk […]
chaos.social
Original post on chaos.social
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Delta Chat @delta.chat · 30/01/2026
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 :) delta.chat/fosdem26.html invite link for […]
chaos.social
Original post on chaos.social
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