On Nov 20, 2006, at 7:29 PM, Mike Jackson wrote:
FYI, I work for a large hosting provider, and I've seen customers who have implemented greylisting, but spammers are getting smart enough to work around it. I doubt that they're wasting resources on queuing for redelivery, but they are recognizing 421s and attempting delivery later.
I too have noticed a diminishing effect of greylisting. Our abuse desk keeps getting more and more spam and it is not possible to put any real filtering in front of it... greylisting helped a lot initially, but the last couple of months it has really gotten out of hand how much spam makes it past greylisting.
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