gonna reply to this thread with urls for the quick reference of anyone reading it, since @adbenitez brought these to my attention. it turns out there are now multiple options for hosting a Chatmail server if you want to be part of the decentralized infrastructure of #DeltaChat:
Madmail, a fork of Maddy (see below) which appears to be optimized for use as a Chatmail server. written in Go. last release: 0.12.7, February 2026.