Ever wondering where the QR codes in #deltachat come from? each of them is handmade, as everything in delta :) #fosdem

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person drawing a QR code on a chalkboard

Now in the #FOSDEM live stream: Holger 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://fosdem.org/2026/schedule/event/TV7GCC-autocrypt_2_post-quantum-cryptography_and_reliable_deletion_forward-secrecy/
#DeltaChat #forwardsecrey #reliabledeletion

#XMPP groups are centralized depending on a single server, if server dies the group is gone, server stores group metadata

#Matrix servers store a lot of group metadata across servers

with Delta Chat the server stores ZERO metadata/state you don't depend on any server and can easily migrate your profile profile keeping group state and history in your devices

if #DeltaChat had "super groups" with admin/moderation for public rooms, would you switch?

https://support.delta.chat/t/spec-proposal-super-groups/4644

@parismarx #DeltaChat is a strong miss in that article...

@nextcloud

Express yourself securely, unbounded, freely

#DeltaChat #privacy #security #decentralization #diday #digitalindependece #autonomy #independence

on the way to #fosdem #brussels - any questions about #deltachat #chatmail #webxdc #wtf ?

you'll find part of the team, including me, at the Delta Chat booth or events - or watch out for that laptop backside 😅

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part of laptop backside with Delta Chat and CCC typical stickers

If you are looking for a messenger that doesn't depend on US infrastructure (or any other country actually) take a look at #DeltaChat is an #European alternative messenger, it is #anonymous, #decentralized, end-to-end #encrypted, #openSource and free!

it is multi-platform, get it for your system at https://get.delta.chat

#sovereignty #Europe #sovereign #diday

@adbenitez @fasnix @x_cli @eff @cmccullough @delta Sometimes I honestly wonder: when do we cross the point where it makes more sense to tell what is NOT good about #DeltaChat. It is by far the shorter list.

#GoSovereign with #ArcaneChat 💜

#decentralization #encryption #digitalindependence #DeltaChat #sovereign #diday

@Distante #DeltaChat, it is decentralized, doesn't require phone numbers or any private data, onboarding is smooth much easier than in signal, similar UI (it is a signal fork) it has much better multi-device and multi-profile support, secure in-chat mini-apps like notepads, to-do lists, shopping lists, etc

there are alternatives, but they will not gain momentum if you don't promote them and stop misinforming people selling a centralized silo running on amazon as #sovereign
@leanderlindahl

it is never too late to #GoSovereign 🌱

#OwnYourData #decentralization #privacy #DeltaChat #ArcaneChat #digitalindependence #sovereign

when you are trying to sleep at night and suddenly remember that #ArcaneChat / #DeltaChat are the only piece of software out there that makes it possible easily and for free to have a #decentralized #e2ee #mailinglist #newsletter (called "channels" inside the app) that is portable, doesn't depend on a specific/central #email server and can be easily migrated to a completely different server / address without any visible change or disturbance for your subscribers

all FREE and without limits 🤯

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woman in bed with big opened eyes

@rl_dane you can toot from #DeltaChat with the mastodon bridge! discover that and other bots here:
https://deltachat-bot.github.io/public-bots/

Come and join us....

https://chatmail.au/

#Deltachat

an artist drafting items for a new #deltachat wallpaper. including #webxdc #wonster 🤘 other ideas? some important items missing?

#nofilter #drawing

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sketchbook with handdrawn deltachat logo, chatmail logo, rocket, phones, message bubble, monster, cats and dino

@metin for chat app: #DeltaChat https://delta.chat

it is an encrypted, private, decentralized, multi-platform #chat app, with good multi-device and multi-profile support

with it you don't depend on a single server, all your data, chats and contacts live in your pocket, e2e encrypted, without depending on a particular server, you can easily migrate from server to server without losing any chat or groups!

it also has #offlineFirst in-chat mini-games and tools!

Segunda oportunidad para @delta , esta vez usando el cliente/fork #arcanechat desarrollado por @adbenitez@masto.es

Second chance to #deltachat, this time using the @arcanechat client/fork developed by @adbenitez@mastodon.social

#im #p2p #privacy #messenger

#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 random sender and recipient addresses, but those can not be mapped to a phone number or public handle. Servers see IP addresses. But you can use Tor, or a VPN, if you want to hide that.

It' not all bad :)

@goebbe #DeltaChat doesn't have group admins, but recently experimental broadcasting channels were added, that mean teachers can have their own news/announcements broadcast to notify the class about events, appointments, share homework material etc, also for a channel to notify the parents etc. besides other groups and channels among teachers and other workers of the school etc.

@seymour

Yhteystietotsydemeihin on nyt lisätty myös Delta Chat!

Delta Chat on sähköpostiprotokollan päällä pyörivä täysin päästä päähän salattu viestisovellus. Sovellus löytyy useimmille alustoille, ja lukuunottamatta push-ilmoitusten kulkua Googlen palvelimien kautta se on todella lupaava vaihtoehto Signalin ja Matrixin rinnalle yksityisyyttä kunnioittavissa viestimissä.

Samalla tarjolla on nyt avoin chatmail-välityspalvelin osoitteessa https://chatmail.pilviboksi.fi!

Delta Chat -tiliä luodessa, valitse Käytä toista palvelinta -> Skannaa kutsukoodi ja osoita kamera ylläolevassa osoitteessa näkyvään QR-koodiin.

Delta Chat -välityspalvelimet eivät säilytä käyttäjien tunnistetietoja. Push-ilmoitukset eivät myöskään sisällä arkaluontoisia tietoja.

#pilviboksi #vapaampiPilvi #DeltaChat

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Delta Chat logo

New version of the #BabelDungeon apps!!!

✨ what is new? ✨

new light theme and the app will adapt to light/dark mode of your system!

new welcome screen to easily allow to start new game or import backup

now when starting a new game you get to decide what language do you want to learn of the pair, ex. in the Babel Dungeon German/English you can learn German as English speaker or English as German speaker!

and more!

#webxdc #DeltaChat #languageLearning

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screenshot of the main screen of Babel Dungeon (German/English) with "new game" and "import game" buttons

@adele with #DeltaChat you also have the in-chat mini-apps that are useful just to have tools in your "Saved Messages" chat that have synchronized state across all your devices without depending on a central service, ex. notepads, to-do lists, shopping lists, "authenticator app" codes, Calendar, etc.

also Delta Chat is the only one of those that offer an easy way to migrate from server to server without losing your chats or contacts!

I am using it with my family since years

@josephb you can also join this #PixelSocial instance (an anonymous social network inside #DeltaChat) to give your chatlist some content while you convince friends to join Delta Chat and wait to get more contacts:

https://i.delta.chat/#C753A22A447DE8CA18653B9C7668BC822C0561CA&a=pixsocial%40arcanechat.me&n=PixelSocial&i=sz7HYOnPmjG1WWOclOFlGLFv&s=XJFfgZRHwvTVAvBAQKJxFL2F

@adele

@bogo #ArcaneChat is just a #DeltaChat client, my main user is... wait for it... ME! so it is basically Delta Chat with some tweaks to my taste, I shared it and it turns out some other people seem to like it, according to the #GooglePlay downloads it is mainly used in #Russia, #Cuba, #USA, #Iran, #Germany and #India

I don't actively try to convince people to use it, and in general it is better to push for DC that is multi-platform, then in #android some might prefer AC as their DC client

@opensourceopenmind similarly, I got my family and friends to talk to me via #DeltaChat because I simply don't have #WhatsApp, #Telegram etc. in my phone, I never try to convince them talking about encryption or open source, I simply say "I don't use that apps, you can reach me in this one" and then it is about a practical problem and not ideological one, I don't go saying "you should uninstall whatsapp now" but they are more willing to respect/understand your own ideological decisions

@bogo

@delta Hi, can I set a tutanota account with #deltachat?

@vinculum0 thanks for putting up one more server. Is there a way to be chosen randomly by people installing #DeltaChat for the first time?

I'd be curious what your experiences are after a year or so; daily users, bandwidth–, storage– and hosting costs.

Thanks for putting it up! 🤗

@TagHunt currently, #deltachat works everywhere, including china where it's a kind of secret tip on remaining securely connected when cross borders.

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?

#deltachat and #chatmail.is indeed about being readily available when other forms of communications become unavailable or dangerous like in Iran or Russia but also in western and other countries.

hey @european_alternatives - is your site and profile stale or still alive?

'cause your messenger alternatives still lack #deltachat, tho i heard of many ppl trying to submit that

#did #diday #europeanalternatives

Hello @delta

I'm puzzled, the #DeltaChat Android app (from the Google play store, 2.34.0) doesn't offer to set a video chat instance

The version 2.11.0 from the FDroid store does.
Is this intentional?

The first one is set to English, the FDroid one to German

Side problem: while the web version of #FDroid also shows me 2.34.0 the "app store" on #EOS always downloads 2.11.0. It even offers an update but the version stays on 2.11

@soatok @16af93

we welcome scrutiny but prefer co-ordinated security-disclosure via

https://github.com/rpgp/rpgp/security/advisories/new and

https://github.com/chatmail/core/security/advisories/new

We'd be surprised if you find a "0day" exploit against standard #deltachat users but certainly prefer you finding something than eg putin/khomeini-aligned hackers.

@16af93 pgp.fail has zero to do with #DeltaChat, none of the stuff discussed there affect Delta Chat, even @soatok just replied something making clear also their post has nothing to do with delta chat but when using classic email software

it seems you are barking at the wrong tree

@adbenitez @sarah
my first thought when seeing that all invite links point to one server was also that it was a #centralized invite server.

perhaps it would make sense to briefly mention in the #deltachat faq? because it's cool how it works, but also because other chat apps advertised as "#decentralized" really aren't.

for example, the first screen after launching #simplex says: "decentralized. anybody can host servers." then, on the next screen, you can select "configure server operators" which gives you a hardcoded list of just two operators (simplex and flux).

@sarah but it looks to me you are actually looking for reasons not to use #DeltaChat because you already don't want to, so let me help you:

* not good for sending anything bigger than 25-50mb
* no post-quantum encryption yet (but coming)
* no forward secrecy (but coming)
* no sealed sender (possible to implement)
* not usable for public or big groups (no group admin or moderation at the moment)
* once you give your contact to someone you can get added by them to groups

enjoy!

@pemensik full agree, that is what #DeltaChat is doing, working with the existing email infrastructure but forcing encryption and making it totaly transparent to the user so they don't have to worry about it and can't do things wrong, the UI is a chat UI but you send encrypted emails under the hood

@phillip there are email clients like #DeltaChat that allow to send enceypted emails without footguns, there it is just not possible at all to reply an encrypted email with unencrypted email and expose the body

@soatok @rootwyrm @FurryBeta

@soatok what I don't get is why you take this opportunity to attack #pgp in general, like taking the opportunity to push for some agenda, the site is called gpg.fail, GPG not PGP, most of the problems are related to gpg or some C code implementation bug, or using gpg and others in the command line and getting tricked by some ansi printing in the terminal, how that translates to "let's kill pgp"? ex. none of the listed problems affect #DeltaChat at all

(I was present in the gpg.fail talk btw)

@wmd there are many computer people pretty happy with #deltachat ... who value precisely that they can use it with their families and friends easily, though.

With a lot of alternative software, the complaint is that it is only usable by specialists. We are pretty happy that in our case it is more the specialists who need to work harder and read the FAQ to understand that some lines of traditional thinking about eg email and pgp do not apply https://delta.chat/en/help

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! 😉

Alt...

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?

Other than the 20 MB file size limit (without the Sharer app) I'm liking #DeltaChat so far. I have a couple profiles set up, and I'm using it to replace my use of Matrix for syncing notes to myself between phone and desktop.

One thing I don't understand is, I sent a 100 MB video to a friend, and it says I'm using 100+ MB on the relay.

I thought the relays were just for moving files? Do I need to delete the video to free that up?

#DeltaChat #AskFedi #DuckDuckFedi

@jan once details are published, and #39c3 is over, well take another look. But note that #deltachat's usage of #openpgp is intentionally minimal. #Gpgfail is a lot about failures of signature verification, and parsing problems in the gpg c-implementation but #deltachat doesn't use these mechanisms or code at all. The @rpgp folks are still studying the details, and there might be issues, so maybe also follow them for more details. Again, this doesn't affect deltachat as things stand.

Relax 😎! GPG is not OpenPGP!

Yesterday, vulnerabilities were published https://gpg.fail but they don't affect #deltachat or other #chatmail clients because

A) We never used #gnupg for anything; we use the modern #rustlang #openpgp implementation @rpgp, security audited multiple times.

B) #openpgp is fine, as modernized in #RFC9580, which already warns against several #gpgfail issues (gpg didn't implement that spec)

Please spread the word that #gpg is not #openpgp ... Thanks! #39c3

@tychotithonus I really recommend you to look into #DeltaChat, there you can have several devices at the same time, without needing to lose the account in one device to transfer to another, every device is also a fully functional main device so you don't depend on a main device or phone number,

besides that it has in-chat mini-apps like to-do lists, shopping lists, collaborative text editor etc. that makes it even more interesting,

it doesn't requires phone numbers or any data for registration

@jwildeboer how do the devs have any control over what people say here in mastodon? and notice from the several thousands of users that use #DeltaChat only a few hundreds know the fediverse even exist 😅

but I don't want to keep you hooked in this thead, thanks for taking the time to answer and have a happy end of the year with family 😁

@jwildeboer sure, promoting and using a centralized service like #signal that in turn pays millons to #aws etc and that has a CEO that makes more money a year than the whole #DeltaChat project is a more mature decision of you, just because you are annoyed by the "fanbois"

@jwildeboer
Just a serious, genuine question: with the fragmentation of #InstantMessenger alternatives what program do you suggest? #xmpp, #deltachat, #simplex, #Matrix #jami #Briar

Quite a few of #deltachat #chatmail and #webxdc folks are already and will be around #39c3 -- on-site you can join a group chat (or send us a DM upfront) where we announce dynamically scheduled sessions. You'll find us mostly around Komona but also other places ... for more info:

https://delta.chat/39c3.html

PSA: Influenza is spreading heavily currently, and 30% of people are infectious without symptoms. Please maintain hygiene and at best test yourself before entering premises. Thanks!

@PossiblyMax @lexinova @cheeaun thanks for the suggestions but please note that a number of experienced UX folks, along with users, are generally quite positive about the usability of #deltachat compared to any other decentralized messenger app. See also our pinned challenge about onboarding UX. Of course there are many things to improve. we have a list of 30+ items ourselves on a short list. Judging our efforts as uninformed on that front might be... uninformed :)

Спасибо тем, кто посоветовал #DeltaChat в качестве удобного #TOTP

Boost pwease

#AskFedi #DuckDuckFedi

What's the difference between #DeltaChat and #SimpleX?

I want to pick one to invest my time in fully setting up. I've tried SimpleX and it's okay but I see DeltaChat is active on Fedi and maybe has more momentum?

All constructive thoughts are welcome!

@pixelschubsi to be honest even if starting today, I think I would still prefer #email over #xmpp, I don't regret one bit the choice they made, at least so far it is doing its job pretty well, #DeltaChat had proper quote-replies even before threading got introduced to #xmpp because it existed in email since forever, there was an RFC for reactions over email as well long ago, email was made for slow networks even before the web, delta chat is being used even over radio in the Amazon rainforest

I have a lot of respect for #DeltaChat (@delta); By all accounts they provide a good looking client and a homogenize experience across platforms. Users absolutely don’t need to care about the underlying protocol!

However there is no way, shape or form in that IMAP+Submission is a more suitable stack for instant messaging than #XMPP.

@daniel The big plus of #DeltaChat is that the infrastructure is already there. Infrastructure is a big part of the problem. And obviously using mail for that is only for people born before 2000.

Second is branding: When people hear #XMPP they hear 20 years of failure of implementing robust solutions both server-side and client-side. People just don't know that after 20 years there now are server and client solutions really working.

Startversuch aktueller Version von DeltaChat

[11469:1214/134139.208764:FATAL:sandbox/linux/suid/client/setuid_sandbox_host.cc:169] The SUID sandbox helper binary was found, but is not configured correctly. Rather than run without sandboxing I'm aborting now. You need to make sure that /opt/deltachat-desktop-2.33.0/chrome-sandbox is owned by root and has mode 4755.
Trace/Breakpoint ausgelöst (Speicherabzug geschrieben)

Ich lasse KEINE Executables mit SUID root auf meinem System zu

#deltachat

@lardier with #DeltaChat there is free #chatmail relays that don't host any data, all is encrypted and you don't have to pay anything, also with 5 euros you can host a chatmail server for several thousands of users!

No hi ha cap aplicació de missatgeria instantània més fàcil d'obtenir-hi un perfil que a #DeltaChat.
- instal·la l'aplicació Delta Chat en el mòbil, tauleta o ordinador
- visita la pàgina web d'un servidor (per exemple el de mastodont.cat a https://xat.mastodont.cat)
- toca/clica on diu "Obté un perfil a xat.mastodont.cat".
- escriu el nom que vulguis
- Fet!

Delta Chat no et demana cap informació personal, ni número de telèfon ni adreça de correu electrònic.
#MissatgeriaInstantània #privacitat

Alt...

Servidor de xat a mastodont.cat per a Delta Chat Benvinguts a la missatgeria instantània, interoperable i que preserva la privadesa :) Obté un perfil a xat.mastodont.cat

@rysiek
> Signal is safe.

#signal has long had issues with phone number leaks: even when set to hidden, phone numbers can sometimes be revealed. 🔓

this means that adversaries can get the phone numbers from an entire network of #signal users from just one compromised device. 🛂

this puts real people in real danger, but #signal is such a strong brand now that many would rather blame those who get hurt than take a critical look at their favourite chat app. ⚠️

more info, including links to some relevant #github issues:
https://veganism.social/@pelle/115673510840264510

#signal doesn't take the phone number leaks seriously, and it's not clear to me from their replies whether they've fixed it. 🪲

#deltachat / #arcanechat (#decentralized #securityaudited #e2ee chat app) avoids accidentally revealing phone numbers by not asking for them. also, allowing for multiple profiles makes it harder for adversaries to track people across different chats, as opposed to #signal with its one profile per device policy. 👥

if #deanonymization is a risk for you, then #signal is not safe. 🥸

unfortunately i had to experience this first hand, which is why i consider »signal is safe« unhelpful advice. 😐

@david_chisnall #DeltaChat is for private chatting, so you normally don't put your link anywhere publicly, you could create a dedicated profile for public interactions tho, which, unlike in signal, it is super easy to do and you can have as many as you want,

and notice the use case I am talking here is family chat, not business and public interactions, that is why I said "keep your family safe" I am talking about family chat solution here

@arcanechat

#DeltaChat is for private chatting, so you normally don't put your link anywhere publicly, you could create a dedicated profile for public interactions tho, which, unlike in signal, it is super easy to do and you can have as many as you want,

Okay, so your use case for 'private chatting' excludes journalists publishing contact information for whistleblowers? It excludes union organisation? It excludes protest organisation?

I guess that's fine, but maybe don't claim to be operating in the same space as Signal then.

and notice the use case I am talking here is family chat, not business and public interactions, that is why I said "keep your family safe" I am talking about family chat solution here

Then you need to learn about the concept of an anonymity set. If you have one mechanism for talking to your family and another different one for talking to your union rep, it's really easy for a passive adversary to track when you suddenly start using a different mechanism for high-value conversations.

@machocam there are several public relays that offer painless onboarding without needing manual registration in DC, for sniket you need to self-host or find someone that invite you to their server

also, recently #DeltaChat and #ArcaneChat made a game-changing release that bring them to a totally different league than #Matrix and #XMPP, now you can have several addresses/servers per profile, and seamlessly migrate from one to another keeping your chats and contacts, peak resilience

@heals

"Tool allows stealthy tracking of #Signal and #WhatsApp users through delivery receipts"

https://cyberinsider.com/tool-allows-stealthy-tracking-of-signal-and-whatsapp-users-through-delivery-receipts/

Another privacy vulnerability caused by the dependency on phone numbers.

In #ArcaneChat (and other #chatmail clients like #DeltaChat) you don't need a phone number (or any private data at all!) to register, so such attacks are simply impossible, keep your family safe, join https://arcanechat.me

This week in #FDroid (TWIF) is live:

* @marcprux caught on video
* Schedule your #39C3 #CCC visit
* Switching relays in #ArcaneChat #DeltaChat
* #Thunderbird drops #MaterialDesign3 🤯
+ 8 new apps
& 156 updates
- 1 app archived

Click play: https://f-droid.org/2025/12/11/twif.html