SPAMCONTROL is a patch to qmail by Erwin Hoffmann and others that adds many missing features to qmail when run as an Internet facing MTA in todays online world.
I have been using the greylisting implementation for qmail from http://shupp.org/ which is based on the implementation for exim from http://www.digitaleveryware.com/projects/greylisting/.
I wanted to add IPv6 support and found no references on the web regarding greylisting and IPv6 (at least no implementation mentioning IPv6).
is 38.107.179.226, you should upgrade to IPv6
