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.

John Peacock <jpeacock@cpan.org>: More changes, fixes and vast
improvements for me to ever catch up on here.

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!).  Lots of fixes and
tweaks.  Apache module.  Event based high performance experiment.

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.

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.

Contributors listed with: git shortlog -sn | cut -c8- | grep -v 'no author'
Updated: Sep 8, 2014 (Update via a PR are welcome)
----------------------
Matt Simerson
Ask Bjørn Hansen
Matt Sergeant
John Peacock
Hanno Hecker
Robert Spier
Devin Carraway
Robert
Radu Greab
Peter J. Holzer
Richard Siddall
Jared Johnson
jaredj
Robin Bowes
Priyadi Iman Nurcahyo
Steve Kemp
Charlie Brady
Markus Ullmann
Diego d'Ambra
Filippo Carletti
luzluna park
Tomas Lee
Jonathan Martens
Peter A Eisch
Pim van den Berg
David Nicol
tpoindessous
Larry Nedry
Karl Y. Pradene
Johan Almqvist
Rick
Jeff King
Hinrik Örn Sigurðsson
Henry Baragar
Shad L. Lords
Guy Hulbert
andreamtp
Dongsik Park
lnedry
Pedro Melo
Norman Maurer