qmail-smtpd regex patch - originally from here
qmail-smtpd verbose logging and mail from domain checking (version 1.1: fix memory leak) - requires qregex patch, partially mine, partially from here
qmail-smtpd regex patch permit/deny (version 1.1: fix memory leak) - allows mailto/mailfrom/helo regular expressions to permit or deny (requires both above patches)
ucspi-tcp per-ip connection limits - partially mine, partially based off of this
set RBLSMTPD variable based on hostname matching a regex (version 1.1: include hostnameregex in install) - inspired by qregex patch