Community developments

Active development takes place in the chatmail/relay github repository.

You can check out the ‘chatmail’ tag in the support.delta.chat forum and ask to get added to a non-public support chat for debugging issues.

We know of three work-in-progress alternative implementation efforts:

• Mox: A Golang email server. Work is in progress to modify it to support all of the features and configuration settings required to operate as a chatmail relay.

• Madmail: a Rust-based single-binary chatmail relay. Madmail v2 is a rewrite of an earlier experimental fork of Maddy Mail Server. It includes SMTP, IMAP, encryption enforcement, and real-time services (TURN/Iroh), and runs on Linux and Windows.

• Chatmail Cookbook: A Chef Cookbook implementing a relay server. The project follows the official relay server software and configurations converted to a Chef Cookbook with only minor differences. The cookbook uses DNS-01 for certificate validation and additionally supports FreeBSD. It does not require a Chef server to use.