actually about a year and a half ago there was a new spambot which was re-sending the message after a temporary reject. But it did it precisely in 4 minutes after the first rejection, and never tried again. So, increasing the greylisting timeout to 5 minutes has solved the problem :)
----- Original Message ----
From: Adrian Senn adrian@senn.ch To: swinog@swinog.ch Sent: Thursday, September 11, 2008 9:37:08 PM Subject: Re: [swinog] RBL's (again) (Was: Anyone from Green here?)
Stanislav Sinyagin schrieb:
I don't know anything about proper spammers. Greylisting has reduced the amount of incoming spam significantly, probably at 90-95%. Of course there are spambots which play around greylisting, but they aren't yet that widely used.
Agreed.
For my mail system at business i have at the moment a high amount of blocked mails by greylisting, swinog list and some other RBL lists. At the beginning of this week we had a high amount of blocked mails. Reason was probably a new wave of spam bot mails. Without the blocking system our mail gateway wouldn't be able to process the load. And no we don't have any complains since months! Nor for the greylisting , nor for the RBL blocking.
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