s/qmail (Version 3.x)

s/qmail (pronounced skew-mail) is the combination of qmail-1.03 + Spamcontrol V2 + IPv6 support packaged together.

Features

Note: s/qmail provides a SPF hook, but does not support it directly. DKIM is still under investigation.

The software is due in 2015.

Roadmap

I've started integration of IPv6 into Spamcontrol. The following resources are available:

Protocol extension: QMTPS

s/qmail will provide additionally the TLS-secured protocol QMTPS to couple several s/qmail instances and distributed queues among different nodes.
IANA has now assigned port 6209 for QMTPS.

Development goals

What I'm aiming for:

Communication and security features:

Usage features:

Development state of s/qmail (April 2015):

s/qmail network components and their capabilities; bold: servers, slanted: clients; *) requires ucspi-ssl-0.9x libs
Module Protocols IPv4 IPv6 TLS STLS/STARTTLS
qmail-smtpd SMTP, SMTPS with ucspi-tcp/ucspi-ssl with ucspi-tcp6/ucspi-ssl-0.9x ucspi-ssl-0.9x STARTTLS
qmail-qmtpd QMTP with ucspi-tcp/ucspi-ssl with ucspi-tcp6/ucspi-ssl-0.9x ucspi-ssl-0.9x n/a
qmail-qmqpd QMTP with ucspi-tcp/ucspi-ssl with ucspi-tcp6/ucspi-ssl-0.9x no plans n/a
qmail-pop3d POP3, POP3S with ucspi-tcp/ucspi-ssl with ucspi-tcp6/ucspi-ssl-0.9x ucspi-ssl-0.9x STLS
qmail-remote*) SMTP, SMTPS, QMTP STARTTLS
qmail-smtpam*) SMTP
qmail-qmqpc QMTP planned no plans n/a
qmail-tcpto n/a n/a n/a
ipmeprint n/a n/a

Note: The checkmark (✓) means 'integrated' but not necessarily fully tested.