Hi Jeff. Am Montag, 24. September 2007 schrieb Jeff Jansen: > I'm sure many of us would appreciate it if you'd update the list in the > future on how well this works at preventing spam. (At least I know I > would.) I've seen mixed reviews about the efficacy of greylisting, and > I'd love to hear first-hand from someone using courier how effective it > really was.
For some reasons, I wrote a greylisting-filter from scratch instead of using comeagain.py or some variants. But I think the efficiency would be comparable. After a month of usage (must have been in february this year), I wrote this (german) article in our company blog: http://schokokeks.org/ein_monat_greylisting For non-germans, here the facts (counters are of a 24-hour-period): * accepted messages: 2471 * auth-smtp-messages (unfiltered pass-through): 981 * temporary rejected messages: 3554 * temporary rejected but accepted later ("second try"): 273 * messages that didn't come again: 3281 * overall arriving messages: 6025 That means: Only 273 out of 3554 delayed messages came again. So less than 10 % of the messages with unknown receiver/sender- or ip-adresses were accepted at all. and We rejected 3281 messages out of 6025 arriving mesages due to greylisting. That's more than half of all messages. cu, Bernd -- Die kleineren Übel sind meist von längerer Dauer. - Wieslaw Brudzinski (poln. Schriftsteller)
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