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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 · 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 · 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 · 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."
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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 · 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 · 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 · 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
0911
Delta Chat @delta.chat · 30/12/2025
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! 😉
me: wanna try #deltachat with me? here's a invite link!

most people including grandparents 💜 got it working nice that was pretty easy thx!

computer people 🫠 wait, can i import my key? can't seem to get that working. sometimes i also get a message on thunderbird first before delta chat know why that's happening? i also read on hacker news that gpg should never be used for secure communication i don't know if i trust this. i can't seem to chat with my gmail acct i thought this was just email?
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Delta Chat @delta.chat · 30/12/2025
#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]
Picture of the congress rocket in various laser colors.  Taken from https://woof.tech/@Purple/115809359193169798
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Delta Chat @delta.chat · 12/12/2025
Your chat profile/identity: a tar file. Your social web app: a zip file. chatmail.at and webxdc.org are spearheading ever new and more fun ways to deny power to servers and platform billionaires. Unlike classic email servers, #chatmail relays […] [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 · 11/12/2025
#deltachat PSAs regarding the last 24 hours: 1) If you messaged someone about 20-30 hours ago, and did not get an expected response/receipt better "resend" (long-tap or right-click the message to resend). Unfortunately, not all queued messages at the crashing […] [Original post on chaos.social]
jack-sparrow-sinking-ship meme with three text parts:
the sinking boat: "nine's discs failing"
Sparrow stepping on to the harbor: "Nine's admins" 
The safe harbor: "New Nine server / 2.33 Multi-relay releases rolling"
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Delta Chat @delta.chat · 11/12/2025
#chatmail relays really are the dumbest messaging servers in town, but having fun with each other 😂 chatmail.at/doc/relay
the three-dragons meme, with matrix and signal being left and middle, very serious and powerfully looking, while chatmail is the third dragon looking more dumb but also more enjoying themselves?
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Delta Chat @delta.chat · 03/12/2025
On the occasion of SimpleX and Session getting cryptocoin-donations/funding ... we won't hide that most delta contributors are pretty skeptical of cryptocoin-circles. Exhibit 1: Webxdc apps -- mini apps that anyone can whip up -- and the declared motto still on […] [Original post on chaos.social]
screenshot of https://webxdc.org web page with the logo, and the following title, subtitle and motto 

webxdc
web apps shared in a chat

no logins, no coins, no platforms 🎉
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Delta Chat @delta.chat · 03/12/2025
#Telegram has a nice and fast UI, granted. But the 1 billion people using TG are at risk because of its big central database that any state security service craves for. Moreover, several anonymization proxy-bot offerings were hacked in 2024, identifying […] [Original post on chaos.social]
Chatmail logo from https://chatmail.at 
it's an @ character but with a speech chat deformation in the left button.
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Delta Chat @delta.chat · 26/11/2025
#chatmail does secure email federation that works. Using lean "relay" servers that enforce metadata-minimized end-to-end encryption. There is a new little tool that checks whether two relays are interacting well for messaging, and how fast. You need a terminal […] [Original post on chaos.social]
screenshot of a command installable with "pip install cmping". 
(venv) hpk@gamma:~$ cmping mailchat.pl nine.testrun.org

# using accounts_dir at: /home/hpk/.cache/cmping

CMPING mailchat.pl(jscsiirgr@mailchat.pl) -> nine.testrun.org(76yzfhcig@nine
64 bytes ME -> mailchat.pl -> nine.testrun.org -> ME seq=0 time=899.98ms
64 bytes ME -> mailchat.pl -> nine.testrun.org -> ME seq=1 time=537.55ms
64 bytes ME -> mailchat.pl -> nine.testrun.org -> ME seq=2 time=583.42ms
64 bytes ME -> mailchat.pl -> nine.testrun.org -> ME seq=11 time=555.63ms
...
64 bytes ME -> mailchat.pl -> nine.testrun.org -> ME seq=12 time=560.16ms
64 bytes ME -> mailchat.pl -> nine.testrun.org -> ME seq=13 time=543.74ms
64 bytes ME -> mailchat.pl -> nine.testrun.org -> ME seq=14 time=641.86ms
64 bytes ME -> mailchat.pl -> nine.testrun.org -> ME seq=15 time=649.15ms
64 bytes ME -> mailchat.pl -> nine.testrun.org -> ME seq=25 time=553.25ms
64 bytes ME -> mailchat.pl -> nine.testrun.org -> ME seq=26 time=583.68ms
64 bytes ME -> mailchat.pl -> nine.testrun.org -> ME seq=27 time=641.81ms
64 bytes ME -> mailchat.pl -> nine.testrun.org -> ME seq=28 time=650.70ms
64 bytes ME -> mailchat.pl -> nine.testrun.org -> ME seq=29 time=558.98ms
--- jscsiirgr@mailchat.pl -> 76yzfhcig@nine.testrun.org statistics ---

30 transmitted, 30 received, 0.00% loss

rtt min/avg/max/mdev = 537.554/596.469/899.980/71.002 ms
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Delta Chat @delta.chat · 22/11/2025
@castaway see "security" section in wikipedias article en.wikipedia.org/wiki/Telegram_(sof…
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Delta Chat @delta.chat · 21/11/2025
The #chatmail #rust core is the base infrastructure library used by all apps and bots. It contains all networking, encryption, email processing and implements all the relevant IETF email standards. It's a single central development place with which the whole […] [Original post on chaos.social]
screenshot of Overview at  https://github.com/chatmail/core/pulse

103 active pull requests, 63 active issues
90 merged pull requests, 13 open pull reqwuests
40 closed issues
23 new issues
"trade offer meme"| with a guy folding his hands, below the following text in two columns: 

i receive: PR review
you receive: PR review
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Delta Chat @delta.chat · 19/11/2025
Signal just released a "poll" feature with great fanfare, while all #deltachat apps already integrated a full suite of chat-shared apps, checklists, polls, shopping lists, calendar, editor + tons of games. Better, anyone can create new apps, eg as […] [Original post on chaos.social]
web page screenshot of https://webxdc.org/apps screenshot of official Signal account in Signal Android that announces "Signal polls are here" with three paragraphs of explanation.
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Delta Chat @delta.chat · 19/11/2025
Any data that is collected on servers will eventually leak or be abused otherwise. By design, no one can enumerate #deltachat profiles which are private and not published on any server. Conversely, #chatmail relays do not see or collect private data or metadata […] [Original post on chaos.social]
beginning of the title of the research paper on the whatsapp number leaks  https://github.com/sbaresearch/whatsapp-census/blob/main/Hey_there_You_are_using_WhatsApp.pdf
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Delta Chat @delta.chat · 18/11/2025
hypercentralizers are not having a good day today -- #github has joined #cloudflare to block or slow down millions of folks from doing stuff. Maybe a good time to checkout out this new ACLU article about the current Apple/Google app-store oligopoly […] [Original post on chaos.social]
last paragraph of https://www.aclu.org/news/free-speech/app-store-oligopoly

How we can push back

In an increasingly centralized world, it will take very little for an abusive government to cause an effective organizing tool to disappear, to block an app that belongs to a critical dissenting media outlet, or to force invasive malware into a software update used by everyone. We need a shared infrastructure that doesn’t permit this kind of centralized control. We can disrupt oligopolistic control over software through user choice (e.g., preferring and installing free software), building good protocol frameworks (e.g., demanding tools that use open standards for interoperability), and through regulatory intervention (e.g., breaking up monopolistic actors, or mandating that an OS must allow sideloading, as the EU did with the DMA).

The device you carry with you that is privy to much of your life should be under your control, not under the control of an abusive government or corporations that do its bidding.
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Delta Chat @delta.chat · 13/11/2025
Denmark and other EU governments still pursue #chatcontrol. They still want to permanently legalize client-side scanning but postponed making it mandatory. They also want to increase age-verification controls which risk to ruin what little is left of privacy […] [Original post on chaos.social]
What happened today?

Behind closed doors, the Law Enforcement Working Party group approved the revised Danish Chat Control compromise with broad support. While mandatory scanning had officially been dropped, Article 4 of the new text reframes and reintroduces it by obliging providers of e-mail, chat, and messenger services to take “all appropriate risk mitigation measures”. This effectively forces providers to scan all messages, including private, end-to-end encrypted content.

The same article outlaws anonymous communication by requiring every citizen to verify their age before accessing a service, kneecapping whistleblowers, journalists, political activists, and people seeking help who depend on anonymity. Article 6 further imposes a, digital house arrest and would ban minors from installing software which comes with a significant risk of grooming, such as WhatsApp, Instagram, and online games like Roblox. What happens next?

The legislation now moves to the Coreper (Committee of Permanent Representations) for approval. Without major political objections, the Council will formally adopt its position. At this stage, both the Council and Commission unite in imposing mass surveillance on all 450 million citizens of the European Union and we enter a rushed trilogue. Unfortunately, while the mandate of the European Parliament does not suffer from the same flaws, the Parliament is traditionally known for giving in.

What now?

We raise our voices. Louder.
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Delta Chat @delta.chat · 02/11/2025
We hereby challenge _all_ other messaging apps, FOSS or not, to provide a more convenient private onboarding experience than #deltachat 1. Install app 2. "Create new profile" 3. Enter nick name, tap "Agree and continue" 4. Tap "+" and "new contact" and […] [Original post on chaos.social]
Start screen of https;//get.delta.chat apps which shows 

Delta chat logo (Greek letter delta) 

Secure decentralized chat

"Create new profile" button highlighted Create profile screen 

With a field to enter a name ... "Fediverse chicken" was typed 

A link to the privacy policy of nine.testrun.org, the default onboarding chatmail relay 

A highlighted button "agree and continue" 

A button "use other server" Screenshot of newly created profile 

Title bar "fediverse chicken" 
Two chats in the chat list: 

"Device messages" with instructions how to setup contact with another chat profile 

"Saved messages" where you can "save" messages from other chats to memorize them
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Delta Chat @delta.chat · 25/10/2025
Our project is one of constant exit planning and circumvention considerations ... as times and tech are getting more shitty. We don't bet on a single basket, and not a single state or jurisdiction, and certainly not AWS/Google/Microsoft US clouds which run […] [Original post on chaos.social]
Logo of the https://chatmail.at project
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Delta Chat @delta.chat · 21/10/2025
Not taking Venture Capital money means: - No pressure to maximize monetization of usage (for every million of VC funding you need to find ~100+ Million in value later). - No prioritization of growing fast with PR campaigns that promise the moon and stumble on […] [Original post on chaos.social]
home page picture of https://testrun.org 

text title "Testrun.org"  with the sub title "experimenting with the future of Email"

the picture is a collage and shows the head of a dinosaur with an open mouth and many teeth trying to swallow a Zeppelin that seems to be flying directly into the mouth.  Next to the dinosaur head is a classic "@" email symbol. 

the middle part is blue, and has overlay graphics of a moon-like planet and some old computers in the back

the bottom part contains a picture of a sysadmin ca. 1975 in front of computer screens that show green letters on a black screen.  There also are separately three cryptic letter chains that seem to translate to "Communications", "Command" and "Sigma".  Another "@" sign is left of the computer screens.
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Delta Chat @delta.chat · 10/10/2025
What an announcement from #Telegram owner Pawel Durov! To provide just a few critical notes, he - makes believe he is just a commoner, and not the billionaire owner of one of the largest message, media and metadata *cleartext* databases on earth - skips over […] [Original post on chaos.social]
screenshot of Telegram-owner Pavel Durov's message: 
< Pavel Durov @ : 10.7M subscribers *

I'm turning 41, but | don't feel like celebrating.

Our generation is running out of time to save the
free Internet built for us by our fathers.

What was once the promise of the free exchange
of information is being turned into the ultimate
tool of control.

Once-free countries are introducing dystopian
measures such as digital IDs (UK), online age
checks (Australia), and mass scanning of private
messages (EU).

Germany is persecuting anyone who dares

to criticize officials on the Internet. The UK is
imprisoning thousands for their tweets. France is
criminally investigating tech leaders who defend
freedom and privacy.

A dark, dystopian world is approaching fast —
while we're asleep. Our generation risks going
down in history as the last one that had freedoms
— and allowed them to be taken away.

We've been fed a lie.

We've been made to believe that the greatest fight
of our generation is to destroy everything our
forefathers left us: tradition, privacy, sovereignty,
the free market, and free speech.

By betraying the legacy of our ancestors, we've
set ourselves on a path toward self-destruction

— moral, intellectual, economic, and ultimately
biological.

So no, I'm not going to celebrate today. I'm
running out of time. We are running out of time.
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Delta Chat @delta.chat · 19/07/2025
some new #webxdc apps ....for personal or group journaling or running a minimal original "twitter" style social network in a larger chat group, end-to-end encrypted and private, without anyone outside being able to access anything except for the chat group […] [Original post on chaos.social]
a look at the new webxdc apps at https://webxdc.org/apps 
"Tiny moments, a minimalist journal" from durian 
"Quiet Journal, a minimal journaling apps" from MapleDiss
"PixelSocial", a pixelated social network from ArcaneCircle
"Bable Dungeon, Portugues/English practises" from ArcaneCircle
primary view on "pixel it" app posts,  with two entries: 
- "Delta purple skull ghost" with some house corner visible and a light projection on the wall. Two people have "hearted" this. 
- "The delta ghost" with some picture of a classic ghost shape with a pixelated "delta" on top https://webxdc.org/apps/#arcanecircle-pixelit social media app runs full screen: 
showing someone posting a (pixelated) picture of a lake and beach with the text "I miss the sun" and one person answers "Also i am fine to ge ta bit of rain after all this sunny week" and another one "I am enjoying the rain vibes with chill music"
020
Delta Chat @delta.chat · 04/07/2025
Two of our teams just gave talks at the "Salt the Stack" conference in Lille: @Xeniax tells the story of "federated messaging" waves and her usable security research, emphasizing "availability" as a key issue […] [Original post on chaos.social]
Screenshot of Ksenia starting her "Always more secure talk"
screenshot of talk on "Usable end-to-end security with Delta Chat and Chatmail".  Slides are at https://merlinux.eu/x/pts25/slides.html
001
Delta Chat @delta.chat · 28/06/2025
Internet fragmentation is real in many countries and regions today but did you know that this "Sometimes-Internet" was the reality of the 1980ties when #email evolved? #chatmail relays are cheap, secure, fast, ephemeral and resilient server setups for the […] [Original post on chaos.social]
Chatmail logo ... The classical "@" sign but with a chat bublle on the lower left 

https://chatmail.at
034
Delta Chat @delta.chat · 27/06/2025
We used to look closely at #whatsapp Usability/UX. Not anymore. Meta is enshittifying WA to become a social media app, charging companies for access to followers, showing ads, and pushing AI slop down the throat of billions of people. #deltachat remains all […] [Original post on chaos.social]
Screenshot of article https://www.theverge.com/news/693310/whatsapp-ai-message-summaries-meta
Showing the headline "Whatsapp rolls out ai generated summaries for private messages"if this thing (meta AI icon) is triggering you, probably it's time...

Switch to Delta Chat, visit https://get.delta.chat in 5 min your chats will be freed.Screenshots of android and desktop delta chat apps from the https://delta.chat website
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Delta Chat @delta.chat · 22/06/2025
Overheard last night from two users in #Cuba user1: "the people are currently in need not only to save data plan but also to have more security in their conversations" user2: "also stability. Right now the whole of Guantanamo is in blackout with problems in […] [Original post on chaos.social]
Las personas ya estan necesitando no solo ahorrar sus megas si no también tener seguridad en sus ' conversaciones Las personas ya estan necesitando no solo ahorrar sus megas si no también tener seguridad en sus con... 

Ademas de |la estabilidad. Ahora mismo todo Guantanamo apagado con problemas en varias radio bases por el lio de la corriente. Y yo aqui - .ablando como si nada 

L 8 03:14 E ~  Cuando WhatsApp no se me conecta . - : spanish chat message, translated to english:

And then in another conversation: 

"I can tell you that in this moment I don't have electricity and WhatsApp, telegram and Facebook Messenger don't manage to connect, on the other hand this one is fully functional"
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Delta Chat @delta.chat · 18/06/2025
Everyone returns to email in the end. We are there already. #whatsapp wants you to add your email to secure your account ... despite all the nay sayers and numerous well funded attempts and claims to kill #email not even WA can do it. #deltachat and #chatmail […] [Original post on chaos.social]
Whatsapp message suggesting to add your email address for extra security
010
Delta Chat @delta.chat · 07/06/2025
#whatsapp claims end to end security of content but: - ties your identity to a phone number - owns your identity - can see who messages whom and who is in which group etc - forces you to send local search in your private chats to Meta AI - does not allow to […] [Original post on chaos.social]
Whatsapp broadcast message to users.  

*Not even WhatsApp can see your personal messages*
That includes text messages, voice messages, photos, videos, calls, and more. They’re protected with end-to-end-encryption, because we’re always committed to protecting your privacy.Screenshot of mainmpage at https://delta.chat
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Delta Chat @delta.chat · 26/05/2025
The last two days saw the number of push notifications spike. Sometimes 80K Google Play push notifications happened per hour, while the baseline was more around 10-20K. These spikes probably indicate Internet availability. #deltachat is offline-first: you can […] [Original post on chaos.social]
a graph showing "Direct push notifications for the last hour"

On the X axis it starts around May 24th 7:30pm and goes until May 26th 7:30pm. 
On the X axis it goes from 0 to 80K notifications for the last hour. 

There are two plot lines:

- Apple push notifications which are in the range of 7K and 15K notifications in every hour. 
- Google Play notifications which is between 10k and 80k notifications per hour. There are around 5 spikes that go up to 70k or above 80k notifications in every hour.
010
Delta Chat @delta.chat · 16/05/2025
It had to happen: in-chat multi-player #Quake III Arena #webxdc app, running over @n0iroh and using the fine work of ioquake3.org folks. Quake3 app is 1.2MB but you need to download once a game file of ~50 MB. It's only one level […] [Original post on chaos.social]
screenshot of Quake app at https://webxdc.org/apps/#wofwca-quake3 A screenshot of a Delta Chat group chat where a quake3 webxdc app is posted, showing the Quake logo, and there is a "start button".  Wofwca (the author of the quake webxdc app) immediately is ready and joins the game.  A short while later there are three people from the chat playing. screenshot of an in-game quake situation where the player just "fragged Holga, 1st place with 16" (kills) 
Screenshot of in-game quake with a player looking down on a situation where a rocket launcher just exploded.
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