Postfix greylisting policy service with auto-white-listing written in Perl with SQL database as storage backend. Greylisting stops 50 to 90 % junk mails (spam and virus) before they reach your Postfix server (saves BW, user time and CPU time).
Follow SQLgrey Postfix greylisting service
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Been running this in ~10 years in production to date. No issues, just works. (oh, and im a developer on this project and thus a little biased :))
Seems to be a problem if you try to enable the clustering option. :( Does anyone know how to fix this problem?? Nov 6 20:11:25 mta-0 sqlgrey: dbaccess: Using DBIx:DBCluster Nov 6 20:11:25 mta-0 sqlgrey: fatal: Can't locate object method "connect" via package "DBIx::DBCluster" at /usr/sbin/sqlgrey line 843.
Sqlgrey is perfect! Thanks.
Does what it says on the tin. Generally requires very little in terms of management or server resources.
I'm the main developer, of course I like it :-) Seriously, it gets the job done without getting in the way.