JMAP/IMAP/SMTP server
Stalwart Mail Server is an open-source mail server solution with JMAP,
IMAP4, and SMTP support and a wide range of modern features.

JMAP is a modern protocol for synchronising data such as mail,
calendars, or contacts that makes much more efficient use of network
resources.

Maintainer: The OpenBSD ports mailing-list <ports@openbsd.org>

WWW: https://stalw.art/
