Jim Winstead <jimw@trainedmonkey.com>: the core "command dispatch"
system in qpsmtpd is taken from his colobus nntp server.  The
check_badmailfrom and check_mailrcptto plugins.

Devin Carraway <qpsmtpd@devin.com>: Patch to not accept half mails if
the connection gets dropped at the wrong moment.  Support and enable
taint checking. MAIL FROM host dns check configurable.  HELO hook.
initial earlytalker plugin.

Andrew Pam <xanni@glasswings.com.au>: fixing the maximum message size
(databytes) stuff.

Marius Kjeldahl <marius@kjeldahl.net>, Zukka Zitting
<jukka.zitting@iki.fi>: Patches for supporting $ENV{RELAYCLIENT}

Robert Spier <robert@perl.org>: Klez filter.

Matt Sergeant <matt@sergeant.org>: Clamav plugin.  Patch for the dnsbl
plugin to give us all the dns results.  Resident SpamAssassin guru.
PPerl. smtp-forward plugin. Documentation (yay!).

Rasjid Wilcox <rasjidw@openminddev.net>: Lots of patches as per the
Changes file.

Kee Hinckley <nazgul@somewhere.com>: Sent me the correct strftime
format for the dates in the "Received" headers.

Gergely Risko <risko@risko.hu>: Fixed timeout bug when the client sent
DATA and then stopped before sending the next line.

... and many others per the Change file!