I know they've been posted a few times, but could everyone who has
published a greylist solution please reply to this message with details
about it. If there are some new ones I wouldn't mind adding them to the
wiki this weekend.
At present the wiki includes the following implementations
Simple Greylisting with Exim
http://wiki.exim.org/SimpleGreylisting
Greylisting without a database and without Perl
http://wiki.exim.org/DbLessGreyListingRun
Greylisting Using Memcached and Perl
http://wiki.exim.org/GreylistMemcachedPerl
Easy Greylisting Without A Database
http://wiki.exim.org/DbLessGreyListing
Greylisting without a database and without Perl
http://wiki.exim.org/DbLessGreyListingC
A recent bug entry on bugzilla asked if there was a solution that is
capable of working on the network with many exim machines talking to a
single daemon/database without flooding it with SQL. I would imagine
something that used a dlfunc, perlfunc or readsocket would be appropriate.
--
The Exim Manual
http://docs.exim.org/