1 cent per five years .... is the current marginal hosting cost for a #chatmail address, with which #deltachat apps facilitate world-wide private messaging including interactive #webxdc apps that run end-to-end encrypted in any chat group. <1 Million EUR per year is the estimated marginal hosting costs for 350 Million EU citizens. Such scaling requires, however, research and development, including careful UX and #cryptography work. Related writing from @npub16sw5...4c8a

Cryptography scales trust

Protocols are to institutions as packet switching is to circuit switching

Yesterday, 20 people from the

Safe Sisters &#8211; Safe Sisters

community onboarded with #DeltaChat in Lusaka, Zambia. Everything worked! Usability, privacy and #OfflineFirst ops were appreciated and #webxdc app based organizing met strong interest. Many participants engage in addressing challenges from surveillance state actors, family and partner abuse. Moreover, people with visual impairment were happy about Android's screen reader support. It's events like this that validate our efforts! #africa

We have several ground breaking developments going on in the background, and frankly, it's sometimes hard to not pre-announce them excitedly :) However, we struggle to acquire public funding after the OTF contract broke away in February. Current need is around ~50K per month for ~10 people. , and we would like to support some contributors to switch their day job. Fallback: even if funding dries up, #deltachat is bound to continue to work. It's pretty maintainable and intrinsically motivated.

Please help us get rough stats as we don't have technical means to collect such stats, by design. Do you use #deltachat or are considering it? Which kind of operator do you use?

23 is the number of currently active #chatmail relays we heart about by now. Only 6 are listed at

Chatmail: Relays

Chatmail provides FOSS infrastructure for interoperable, secure, speedy and reliable end-to-end encrypted messaging. Check out clients as Arcane C...

to complicate ongoing state-level blocking attempts. Please keep setting up #chatmail relays -- and thanks to all the early adopters and carers! July 2025 some key contributors will do sessions in #Lille, France at @npub1uk4v...z2gq and discuss the state of efforts to scale #deltachat #chatmail and #webxdc to billions of people and bots, without any central points of control.

"if your social media network can go down it is not decentralized" they say and rightfully so. Same is true for much other infrastructure ... Energy, water, internet utilities ... And of course messaging. If your messenger can go down it's not decentralized. During 2025 we aim to make #deltachat and #chatmail infrastructure in particular into the most resilient and mass-user accessible private messenging utility out there ... If it isn't already :)

Today we are unveiling two brand new features by ... drum-roll ... doing nothing: - No "AI" integration involved or planned. Consequently, you don't need to teach your relatives how to disable AI! - No proprietary server components: servers are fast, efficient and freely replicable, no permissions needed! Moreover, our apps are easier to use and onboard with than SIM/phone number based apps: Multi-device and Multi-profile handling is a piece of cake. #deltachat #whatsapp #signal #matrix

#chatmail relays can serve 200k+ users on a small physical machine, are easy to setup and even easier to maintain. Chatmail relays enforce end-to-end encryption and rely on cryptographic verification for interoperability instead of IP reputation and spam checking magic. Tomorrow (Sunday) evening one of the developers will give a hands-on setup workshop in Hamburg

How to setup a chatmail server, optimized for Delta Chat Easterhegg 2025

With Signal, Whatsapp, and other centralized messengers suddenly running their servers in an authoritarian territory, we need a decentralized alter...

#easterhegg2025 #eh22

The trajectory of E2E-encryption is about de-platforming: There shall be no central machines that can control the edges/peers, and the social groups and virtual centers they freely form. Our #deltachat R&D around #chatmail relays and #webxdc apps all aim to realize such a "zero-platforms" fully E2E-encrypted interaction model. However, this is *not* just about cryptographic cleverness. Rather it is about usable anti-authoritarian designs, as explicitly stated in January

Delta Chat: Replacing billionairish platforms with ZIP files

How can we evolve and deploy web apps without allowing developers or operators to become a “billionaire in the middle”? There are many ways to ...

Easter/April offer 🐣 if you are onboarding a small group of family/friends to #deltachat and/or want to setup a insta-federated #chatmail relay let us know about any issues. Just post on fediverse and tag us. In case of bugs/issues we'll see to privately set up a support chat to help sort out any issues, or file accordingly to our development tracker. We want Delta to work flawlessly for private chatting and to better understand any remaining irritations or problems. Thanks and enjoy :)