[Discover] Greylisting: Whitepaper http://projects.puremagic.com/greylisting/whitepaper.html (spam email greylisting security)
 [Discover] Greylisting - Wikipedia, the free encyclopedia http://en.wikipedia.org/wiki/Greylisting (greylisting spamassassin linux antispam)
 [Discover] Postfix SMTP Access Policy Delegation http://www.postfix.org/SMTPD_POLICY_README.html#greylist (greylisting)
 [Discover] Greylisting: The Next Step in the Spam Control War http://projects.puremagic.com/greylisting/ (email spam greylisting software)
 [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] Try out milter-greylist http://hcpnet.free.fr/milter-greylist/#weaknesses (greylisting)
 [Discover] HDC >> Greylisting FAQ https://hdc.tamu.edu/reference/documentation/?section_id=586 (greylisting)
 [Discover] Greylisting http://slett.net/spam-filtering-for-mx/greylisting.html (greylisting)
 [Discover] Greylisting on Red Hat 9 http://www.ccl.net/cca/software/UNIX/greylisting/README.shtml (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)
 [Discover] tumgreyspf: Greylisting and SPF for Postfix in Python http://www.tummy.com/Community/software/tumgreyspf/ (email postfix greylisting)
 [Discover] Greylisting: Vor- und Nachteile - huschi.net http://www.huschi.net/11_279_de.html (tutorial greylisting)
 [Discover] qmail & greylisting spam control - SWsoft – Forums http://forum.swsoft.com/showthread.php?s=&threadid=28645 (email spam greylisting howto)
 [Discover] Nolisting: Poor Man's Greylisting http://nolisting.org/ (email spam mail greylisting)
 [Discover] Grappy - Greylist daemon in Python http://www.stacken.kth.se/~mattiasa/projects/grappy/ (email spam greylisting)
 [Discover] Killing That Spam With Postgrey And Postfix | HowtoForge - Linux Howtos and Tutorials http://www.howtoforge.com/greylisting_postfix_postgrey (postfix spam tech greylisting)
 [Discover] Debian Administration :: Greylisting with exim4 http://www.debian-administration.org/articles/167 (debian greylisting)
 [Discover] Greylisting http://www.ftgate.com/training/f5/webadmin/webhelp/Greylisting.htm (greylisting)

 [Discover] Greylisting.org - a great weapon against spammers http://www.greylisting.org/ (smtp antispam opensource email)