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. 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}