Very interesting, thanks for running these trials! I've currently got graylisting enabled on my own server, but I've been considering turning it off. An interesting statistic to look at, I think, would be the number of connections blocked by graylisting that don't eventually return with a successful delivery. In other words, the number of spambots that are actually deterred by the graylist filter.
-- Sam Clippinger On Nov 20, 2014, at 3:27 AM, Quinn Comendant <qu...@strangecode.com> wrote: > On Tue, 04 Nov 2014 08:05:22 -0700, BC wrote: >> At the suggestion of others here, I turned OFF greylisting last year, >> after having used it for years before that. My spam level didn't >> increase one bit. I think the RBL sites are pretty good at >> identifying spam originations, so I use that method now. > > So to check the usefulness of greylisting, I've done a rough study on our > server. I've run three ten-day periods with different configurations, and > processed the logs for each period using David Ramsden's SpamAssassin logfile > analyser script [1]. > > The difference between greylisting enabled or disabled, all other > configuration the same, is 2x the amount of messages received. During the > period of greylisting, no false positives were reported by our users although > they said their spam load was significantly reduced. It's hard to know from > these number what the actual change in spam is, but I would venture to > interpret the results and say greylisting is still helpful. You can see my > spamdyke configuration here [2]. > > > ===================================================================== > Config 1: SA + rblsmtpd > > Total messages: Ham: Spam: % Spam: > 90824 56264 34560 38.05% > > Average spam score : 11.34/4.78 > Average ham score : -0.01/4.85 > > > ===================================================================== > Config 2: SA + spamdyke (no greylisting) > > Total messages: Ham: Spam: % Spam: > 78271 63730 14541 18.58% > > Average spam score : 10.00/4.80 > Average ham score : -0.05/4.85 > > > ===================================================================== > Config 3: sa + spamdyke + greylisting > > Total messages: Ham: Spam: % Spam: > 39676 31763 7913 19.94% > > Average spam score : 13.31/4.84 > Average ham score : -0.84/4.85 > > > [1] http://www.sourcefiles.org/Log_Analyzers/sa-stats.pl > [2] http://pastie.org/private/bzncofm9e0vhbez8kacnka > > Quinn > > _______________________________________________ > spamdyke-users mailing list > spamdyke-users@spamdyke.org > http://www.spamdyke.org/mailman/listinfo/spamdyke-users
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