Discovered Pages
[Discover] Try out milter-greylist http://hcpnet.free.fr/milter-greylist/#weaknesses
(greylisting) 
[Discover] Brent Meshier " Adding Greylisting support to qmail on Plesk 8 http://meshier.com/2006/09/18/adding-greylisting-support-to-qmail-on-plesk-8/ (spam greylist howto plesk)
[Discover] Postfix SMTP Access Policy Delegation http://www.postfix.org/SMTPD_POLICY_README.html#greylist (greylisting)
[Discover] Grappy - Greylist daemon in Python http://www.stacken.kth.se/~mattiasa/projects/grappy/ (email spam greylisting)
[Discover] SWsoft – Forums - qmail & greylisting spam control http://forums.swsoft.com/showthread.php?s=&threadid=28645 (greylist plesk qmail)
[Discover] jonatkins.com - software/qgreylist http://www.jonatkins.com/page/software/qgreylist (spam greylist qmail)