On 23/01/2010 08:26, Chih-Cherng Chin wrote: >> For me greylisting all mail eliminates most of my spam and I hardly ever >> receive any calls regarding it. > Greylisting is indeed very effective at filtering out bot-sent spam, > which account for more than 80% of global spam now. You can also couple > it with auto whitelist to reduce transimission delay caused by greylisting. > Whenever your users send e-mail, the recepients are very likely to reply. > So why not let their reply bypass greylisting (with exim ACL) automatically? > > Please refer to the following posts for some implementation idea of auto > whitelist for exim: > http://www.gossamer-threads.com/lists/exim/users/68306#68306 > http://www.gossamer-threads.com/lists/exim/users/68924#68924 > > Chih-Cherng Chin > > Botnet Detection with Greylisting: > http://botnet-tracker.blogspot.com/2009/11/greylisting-botnet-detection-honeypot.html
I wrote a short article last year on how I implemented that sort of whitelisting using MySQL as the data store: https://secure.grepular.com/Whitelist_Recipients_in_Exim -- Mike Cardwell : UK based IT Consultant, Perl developer, Linux admin Cardwell IT Ltd. : UK Company - http://cardwellit.com/ #06920226 Technical Blog : Tech Blog - https://secure.grepular.com/ Spamalyser : Spam Tool - http://spamalyser.com/ -- ## List details at http://lists.exim.org/mailman/listinfo/exim-users ## Exim details at http://www.exim.org/ ## Please use the Wiki with this list - http://wiki.exim.org/
