Helios qmail is an advanced qmail distribution
based on qmail-sql. It has SMTP, SMTPS, POP3,
POP3S, IMAP, and IMAPS services, a content
scanner, antispoof and SPF support, SMTP-AUTH,
SMTP-after-POP/IMAP, a PHP5 API, and many other
useful tools.
Information regarding Project Releases and Project Resources. Note that the information here is a quote from Freecode.com page, and the downloads themselves may not be hosted on OSDN.
This is the first stable release that is ready for
use on production systems. It comes with extensive
documentation, including a manual and an
installation guide.