Multi-relay chat messaging & cryptographic identities with Delta Chat and Chatmail relays

https://video.fosdem.org/2026/ud2218a/3F9VTU-deltachat-chatmail-relays-multi-transport.av1.webm

#^https://video.fosdem.org/2026/ud2218a/3F9VTU-deltachat-chatmail-relays-multi-transport.av1.webm

During the past year, #Delta #Chat has been working on multi-relay chat #messaging - you are no longer restricted to one server hosting your identity and transmitting your messages. Instead, the decentralized #chatmail relay network transmits your messages, while your identity remains on your devices only, through the cryptographic key.

In this talk we go into the technical details of multi-relay. We show how we migrate the ecosystem to this new approach, and how it can be introduced without taking away the seamless messaging experience from users.

Delta Chat website: https://delta.chat
Chatmail relay documentation: https://chatmail.at/doc/relay/

Multi-relay chat messaging & cryptographic identities with Delta Chat and Chatmail relays

https://video.fosdem.org/2026/ud2218a/3F9VTU-deltachat-chatmail-relays-multi-transport.av1.webm

#^https://video.fosdem.org/2026/ud2218a/3F9VTU-deltachat-chatmail-relays-multi-transport.av1.webm

During the past year, #Delta #Chat has been working on multi-relay chat #messaging - you are no longer restricted to one server hosting your identity and transmitting your messages. Instead, the decentralized #chatmail relay network transmits your messages, while your identity remains on your devices only, through the cryptographic key.

In this talk we go into the technical details of multi-relay. We show how we migrate the ecosystem to this new approach, and how it can be introduced without taking away the seamless messaging experience from users.

Delta Chat website: https://delta.chat
Chatmail relay documentation: https://chatmail.at/doc/relay/

Multi-relay chat messaging & cryptographic identities with Delta Chat and Chatmail relays

https://video.fosdem.org/2026/ud2218a/3F9VTU-deltachat-chatmail-relays-multi-transport.av1.webm

#^https://video.fosdem.org/2026/ud2218a/3F9VTU-deltachat-chatmail-relays-multi-transport.av1.webm

During the past year, #Delta #Chat has been working on multi-relay chat #messaging - you are no longer restricted to one server hosting your identity and transmitting your messages. Instead, the decentralized #chatmail relay network transmits your messages, while your identity remains on your devices only, through the cryptographic key.

In this talk we go into the technical details of multi-relay. We show how we migrate the ecosystem to this new approach, and how it can be introduced without taking away the seamless messaging experience from users.

Delta Chat website: https://delta.chat
Chatmail relay documentation: https://chatmail.at/doc/relay/