Stalwart is the community for the self-hosted mail server, covering IMAP, JMAP and configuration help.
Stalwart gathers people running the open-source mail server of the same name. Discussion covers IMAP and JMAP setup, deliverability, and the fiddly parts of self-hosting email. Developers and admins trade configuration tips, report bugs, and help newcomers get a working server stood up without losing their minds.