Collaborative open-source successor to qmail
notqmail 1.08 was produced by this motley krewe:
Rolf Eike Beer Manvendra Bhangui Alan Post Amitai Schleier
qmail is a secure, reliable, efficient, simple message transfer agent. It is meant as a replacement for the entire sendmail-binmail system on typical Internet-connected UNIX hosts. See BLURB.md, BLURB2.md, BLURB3.md, and BLURB4.md for more detailed advertisements.
INSTALL.md says how to set up and test qmail. If you're upgrading from a previous version, read UPGRADE.md instead.
See PIC.* for some "end-to-end" pictures of mail flowing through the qmail system.
See https://cr.yp.to/qmail.html for other qmail-related software and a pointer to the qmail mailing list.
Other documentation: https://cr.yp.to/proto.html shows solutions to several Internet mail problems; many of these solutions are implemented in qmail. CHANGES.md and THANKS.md show how qmail has changed since it was first released. SECURITY.md, INTERNALS.md, and THOUGHTS.md record many of the qmail design decisions.