Secure decentralized messaging across all major platforms. Instant and reliable via fast chatmail relays, compatible with classic email providers. Features secure mini web apps for fun and collaboration, end-to-end encrypted and with P2P realtime channels. Security-audited multiple times.
Public Key
npub1lk4qv5hd50c4u9z9kdy53h45dyu3mq9v0qvx0k0ar348703dw2ystl3m2p Profile Code
nprofile1qqs0m2sx2tk68u27z3zmxj2gm66xjwgaszk8sxr8m873c6nl8ckh9zgpzamhxue69uhkummnw3ezuarhd9hxkmr99ekx7mqvf36k3
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Published at
2026-07-29T23:22:07Z Event JSON
{
"id": "388ca790bfa54d856c55b46ac9e2ecb523352ed60b7cd24d04804309ee116a1b" ,
"pubkey": "fdaa0652eda3f15e1445b34948deb469391d80ac781867d9fd1c6a7f3e2d7289" ,
"created_at": 1785367327 ,
"kind": 0 ,
"tags": [
[
"proxy",
"https://chaos.social/users/delta",
"activitypub"
]
],
"content": "{\"name\":\"Delta Chat\",\"about\":\"Secure decentralized messaging across all major platforms. Instant and reliable via fast chatmail relays, compatible with classic email providers. Features secure mini web apps for fun and collaboration, end-to-end encrypted and with P2P realtime channels. Security-audited multiple times.\",\"picture\":\"https://assets.chaos.social/accounts/avatars/000/091/659/original/f259dcdc9fe552fb.png\",\"banner\":\"https://assets.chaos.social/accounts/headers/000/091/659/original/62f9eb7d702229bc.png\",\"nip05\":\"[email protected] \",\"fields\":[[\"Website\",\"https://delta.chat\"],[\"Download\",\"https://get.delta.chat\"],[\"Donate\",\"https://delta.chat/en/donate\"],[\"Support Forum\",\"https://support.delta.chat\"]]}" ,
"sig": "3640b614cab747e9b44951ae108cd024b834a4db7b5ae7ecd39b8774e64f0f4b93be3e551017fc9303d61f9ddde9543e0f8d3f90b1d4b4636189007c15ce9bf3"
}
Last Notes npub1lk4qv5hd50c4u9z9kdy53h45dyu3mq9v0qvx0k0ar348703dw2ystl3m2p Delta Chat @nprofile…5z53 people are running thousand(s) of users on 1GB RAM chatmail relays. Ram and CPU usage is generally pretty low. npub1lk4qv5hd50c4u9z9kdy53h45dyu3mq9v0qvx0k0ar348703dw2ystl3m2p Delta Chat @nprofile…8dhc The relay list should synchronize between the devices automatically. If this did not work, maybe try to add a relay from the other device and check if this is synchronized the other way round. npub1lk4qv5hd50c4u9z9kdy53h45dyu3mq9v0qvx0k0ar348703dw2ystl3m2p Delta Chat @nprofile…8dhc your other devices need to be at least v2.33 to synchronize your relays. Maybe the MacOS client needs to be upgraded? npub1lk4qv5hd50c4u9z9kdy53h45dyu3mq9v0qvx0k0ar348703dw2ystl3m2p Delta Chat @nprofile…jxg0 wir nutzen es selbst viel, und kennen auch viele, die das tun. Im chatmail-relay netzwerk gibt es kaum Probleme mit der Nachrichtenzustellung. Bei klassischen email providern gibt es spam-filter oder configs, die die Nachrichstenzustellung unsicher machen koennen, abgesehen von fehlenden Push notifications. Es ist natürlich nicht auszuschliessen, dass es bugs gibt, gerade auch bei Calls auf bestimmten Geraeten, aber das wird eher auf https://support.delta.chat diskutiert. npub1lk4qv5hd50c4u9z9kdy53h45dyu3mq9v0qvx0k0ar348703dw2ystl3m2p Delta Chat @nprofile…58ej 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. npub1lk4qv5hd50c4u9z9kdy53h45dyu3mq9v0qvx0k0ar348703dw2ystl3m2p Delta Chat Reminder: There are no accounts in the classic sense anywhere with #chatmail or #deltachat. npub1lk4qv5hd50c4u9z9kdy53h45dyu3mq9v0qvx0k0ar348703dw2ystl3m2p Delta Chat 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. npub1lk4qv5hd50c4u9z9kdy53h45dyu3mq9v0qvx0k0ar348703dw2ystl3m2p Delta Chat @nprofile…r5fw Hi :) you need to turn on "Debug Calls" in the "Advanced > Experimental Features" settings, then they should work, on all platforms. If they do not work, please open a bug report on https://github.com/deltachat/ - they are about to become un-experimental very soon. npub1lk4qv5hd50c4u9z9kdy53h45dyu3mq9v0qvx0k0ar348703dw2ystl3m2p Delta Chat @nprofile…v5xn not sure and probably best to discuss in the forum where there are at least related topics. npub1lk4qv5hd50c4u9z9kdy53h45dyu3mq9v0qvx0k0ar348703dw2ystl3m2p Delta Chat @nprofile…7n40 sorry but it's not clear what wording you are refering to precisely. pull requests can be opened at https://github.com/deltachat/deltachat-pages/blob/main/en/help.md and then more properly discussed by the people who care for this page. npub1lk4qv5hd50c4u9z9kdy53h45dyu3mq9v0qvx0k0ar348703dw2ystl3m2p Delta Chat @nprofile…7n40 We are doing our best but mistakes like a wrong link or a misleading link happen. npub1lk4qv5hd50c4u9z9kdy53h45dyu3mq9v0qvx0k0ar348703dw2ystl3m2p Delta Chat @nprofile…7n40 ups, thanks for pointing a bug in our home page! You are totally right to criticize that audits are not the same as security analysis. npub1lk4qv5hd50c4u9z9kdy53h45dyu3mq9v0qvx0k0ar348703dw2ystl3m2p Delta Chat Good news among the bad news! npub1lk4qv5hd50c4u9z9kdy53h45dyu3mq9v0qvx0k0ar348703dw2ystl3m2p Delta Chat @nprofile…jcvg Since version 1.10.0 of chatmail/relay (https://github.com/chatmail/relay/releases/tag/1.10.0) this should not be necessary because of the change that removes more messages when mailbox is about to run out of space. npub1lk4qv5hd50c4u9z9kdy53h45dyu3mq9v0qvx0k0ar348703dw2ystl3m2p Delta Chat @nprofile…9gsf @nprofile…85zd very interesting, thanks! Indeed lateral thinking with withered technology is very close to what we are trying to do ... npub1lk4qv5hd50c4u9z9kdy53h45dyu3mq9v0qvx0k0ar348703dw2ystl3m2p Delta Chat 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: npub1lk4qv5hd50c4u9z9kdy53h45dyu3mq9v0qvx0k0ar348703dw2ystl3m2p Delta Chat Congrats to #protonmail for beating us on introducing Post-Quantum Cryptography into mail messaging! npub1lk4qv5hd50c4u9z9kdy53h45dyu3mq9v0qvx0k0ar348703dw2ystl3m2p Delta Chat Ok, #protonmail beat us on introducing PQC cryptography, but we'll beat them on Reliable Deletion npub1lk4qv5hd50c4u9z9kdy53h45dyu3mq9v0qvx0k0ar348703dw2ystl3m2p Delta Chat @nprofile…vr2t @nprofile…zqdw it's fine to call us out on the mixing of concerns. It was actually meant to direct some attention to other projects and not just put us in the center, but it also was confusing the message a bit, hopefully now sufficiently clarified. Let's maybe not discuss this here further if you can agree -- we can always open a chat group ;) npub1lk4qv5hd50c4u9z9kdy53h45dyu3mq9v0qvx0k0ar348703dw2ystl3m2p Delta Chat 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 president, board or director salaries 🖤 npub1lk4qv5hd50c4u9z9kdy53h45dyu3mq9v0qvx0k0ar348703dw2ystl3m2p Delta Chat @nprofile…4u7t @nprofile…u9q8 @nprofile…c5mx npub1lk4qv5hd50c4u9z9kdy53h45dyu3mq9v0qvx0k0ar348703dw2ystl3m2p Delta Chat @nprofile…v5xn @nprofile…u9q8 @nprofile…zqdw @nprofile…c5mx we edited the post to be clearer about the fact that neither Delta Chat nor the other chatmail clients are receiving funding. The chatmail infrastructure consists of "relay" setup templates and the "core chatmail library" that is used by all clients. More here https://chatmail.at npub1lk4qv5hd50c4u9z9kdy53h45dyu3mq9v0qvx0k0ar348703dw2ystl3m2p Delta Chat @nprofile…zqdw sorry. we edited the original post, reads clearer? Otherwise drop a DM but please keep in mind we have a 500 char limit and dopn't want to rewrite the whole post :) npub1lk4qv5hd50c4u9z9kdy53h45dyu3mq9v0qvx0k0ar348703dw2ystl3m2p Delta Chat We’ve been busy building and releasing but it’s high time to share some major news: @sovtechfund is investing nearly €500K into #chatmail npub1lk4qv5hd50c4u9z9kdy53h45dyu3mq9v0qvx0k0ar348703dw2ystl3m2p Delta Chat @nprofile…q8z8 can you DM us the IP addresses it tries to connect to? It should only try to connect to your mail servers/relays and nothing else. npub1lk4qv5hd50c4u9z9kdy53h45dyu3mq9v0qvx0k0ar348703dw2ystl3m2p Delta Chat @nprofile…sqwl it was about #chatmail relays https://chatmail.at/relays npub1lk4qv5hd50c4u9z9kdy53h45dyu3mq9v0qvx0k0ar348703dw2ystl3m2p Delta Chat "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. npub1lk4qv5hd50c4u9z9kdy53h45dyu3mq9v0qvx0k0ar348703dw2ystl3m2p Delta Chat @nprofile…v5xn thanks for the pointer. we are indeed following rollout of formats as "Jpeg XL". while bigtech support has surged recently, we still have to support lots of older devices that don't support it natively yet and would require additional effort or have poor performance. for that reason, it's not a priority just now, but we’re keeping a close eye on it. npub1lk4qv5hd50c4u9z9kdy53h45dyu3mq9v0qvx0k0ar348703dw2ystl3m2p Delta Chat 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, also making #deltachat iOS users safer. Few know that so called "forward secrecy" is all about deleted messages becoming unrecoverable, see https://autocrypt2.org for our plans npub1lk4qv5hd50c4u9z9kdy53h45dyu3mq9v0qvx0k0ar348703dw2ystl3m2p Delta Chat @nprofile…cq3m it's usually better to find a phone-wide solution to protecting individual app access. Moreover, there are many real-world threats where an app lock does not help at all, unfortunately. FWIW you can backup your account to a file, store it remotely, delete Delta Chat, and and re-instate it all later when needed and safe again. To discuss this more in depth, it's better to move to the https://support.delta.chat npub1lk4qv5hd50c4u9z9kdy53h45dyu3mq9v0qvx0k0ar348703dw2ystl3m2p Delta Chat #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. npub1lk4qv5hd50c4u9z9kdy53h45dyu3mq9v0qvx0k0ar348703dw2ystl3m2p Delta Chat @nprofile…4sxc we strive towards making relay selection completely automatic, but for now we want to make sure it works at all, and smooth around the edges ;) npub1lk4qv5hd50c4u9z9kdy53h45dyu3mq9v0qvx0k0ar348703dw2ystl3m2p Delta Chat @nprofile…3jrm If you add multiple relays to your profile and change between them, you will appear as the same contact, both in 1:1 and group chats. Internally since Delta Chat v2 all contacts in encrypted chats (the ones not marked with an envelope icon) are identified by their OpenPGP key, and it does not matter from which email address the message arrives, so when you switch to another address your contacts will likely not even notice unless they look in debug info. npub1lk4qv5hd50c4u9z9kdy53h45dyu3mq9v0qvx0k0ar348703dw2ystl3m2p Delta Chat @nprofile…3jrm You can switch the sending relay at any time. If you send a message and sending gets stuck because the sending relay is not reachable, you can select another relay for sending and keep sending messages. There is no automatic "failover" yet. npub1lk4qv5hd50c4u9z9kdy53h45dyu3mq9v0qvx0k0ar348703dw2ystl3m2p Delta Chat @nprofile…8dhc Go to your existing profile. Settings. Advanced. Relays. And add a relay there. npub1lk4qv5hd50c4u9z9kdy53h45dyu3mq9v0qvx0k0ar348703dw2ystl3m2p Delta Chat @nprofile…8dhc the instructions were about adding a second relay. In the screen you posted you can just create a profile and then go to advanced settings. npub1lk4qv5hd50c4u9z9kdy53h45dyu3mq9v0qvx0k0ar348703dw2ystl3m2p Delta Chat @nprofile…8dhc Are you doing this on the phone or on desktop? npub1lk4qv5hd50c4u9z9kdy53h45dyu3mq9v0qvx0k0ar348703dw2ystl3m2p Delta Chat @nprofile…65e6 using two relays means that it works when either one of them works. When one fails, the other can still be used for chatting. It does not introduce a dependency but makes your more independent from any single server. npub1lk4qv5hd50c4u9z9kdy53h45dyu3mq9v0qvx0k0ar348703dw2ystl3m2p Delta Chat @nprofile…65e6 You can use your own mailbox on a non-chatmail server if you want. If you are sure it works reliably all the time, you also don't need multiple mailboxes. You can also add chatmail mailboxes next to non-chatmail ones if you want to have things working when your server is down but chatmail relay you added works. npub1lk4qv5hd50c4u9z9kdy53h45dyu3mq9v0qvx0k0ar348703dw2ystl3m2p Delta Chat 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: npub1lk4qv5hd50c4u9z9kdy53h45dyu3mq9v0qvx0k0ar348703dw2ystl3m2p Delta Chat @nprofile…sr57 new releases are rolling 2.49 bug fixes mostly. Well see what next releases bring :) npub1lk4qv5hd50c4u9z9kdy53h45dyu3mq9v0qvx0k0ar348703dw2ystl3m2p Delta Chat "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 communities that people are molding for themselves. We are just providing tools and approaches that work ... At least most of the time 😅 "Nothing works all the time" is another project mantra. Brb preparing the next releases :) npub1lk4qv5hd50c4u9z9kdy53h45dyu3mq9v0qvx0k0ar348703dw2ystl3m2p Delta Chat @nprofile…vhxg currently 2.49 begins rolling (bug fix releases) and then channel improvements are "ASAP"/ next release :) npub1lk4qv5hd50c4u9z9kdy53h45dyu3mq9v0qvx0k0ar348703dw2ystl3m2p Delta Chat @nprofile…szsq actually, if you ask so directly: we've heart rumors of a web client beginning to work, but it's a very wild project we won't point to, yet. Quite obviously,. there are challenges around E2EE and security when doing a chatmail web client. Stay tuned :) npub1lk4qv5hd50c4u9z9kdy53h45dyu3mq9v0qvx0k0ar348703dw2ystl3m2p Delta Chat 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 :) npub1lk4qv5hd50c4u9z9kdy53h45dyu3mq9v0qvx0k0ar348703dw2ystl3m2p Delta Chat @nprofile…hca9 did you try enabling "Debug Calls"? See also https://delta.chat/en/2026-03-31-zero#native-calls-on-android-and-ios npub1lk4qv5hd50c4u9z9kdy53h45dyu3mq9v0qvx0k0ar348703dw2ystl3m2p Delta Chat @nprofile…dnwg fixed, thanks. npub1lk4qv5hd50c4u9z9kdy53h45dyu3mq9v0qvx0k0ar348703dw2ystl3m2p Delta Chat the public #chatmail relay list https://chatmail.at/relay covers about ~20% or so of chat relays we heart about and have traces or hints from, and we definitely don't see everything -- which is how it should be :) npub1lk4qv5hd50c4u9z9kdy53h45dyu3mq9v0qvx0k0ar348703dw2ystl3m2p Delta Chat What if all public funding and all private donations to our efforts stop tomorrow? npub1lk4qv5hd50c4u9z9kdy53h45dyu3mq9v0qvx0k0ar348703dw2ystl3m2p Delta Chat @nprofile…dmmg true story: we regard German train rides and using wifi there as a good test bed for our networking code's ability to work in slow and malfunctioning networks. For example two travelling contributors messaged and established p2p realtime networking between two high speed running ICE trains, to test robustness and reconnection fitness :) npub1lk4qv5hd50c4u9z9kdy53h45dyu3mq9v0qvx0k0ar348703dw2ystl3m2p Delta Chat 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. npub1lk4qv5hd50c4u9z9kdy53h45dyu3mq9v0qvx0k0ar348703dw2ystl3m2p Delta Chat #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 assembly or board that decides everything. It's more chaotic and admittedly hard to get an overview on, but thats' also how the yearly #CCC congress comes about, which many of us regularly attend.
