Until the spammers build in retry into their bots, I'm a
firm believer of greylisting.
They have. I'm a sys admin at a major hosting provider, and I've seen it
in action on at least one customer's box who was using greylisting.
Considering spammers have near-infinite resources, it was only a matter
of time before they'd either retry delivery on the same message, or
simply wait an hour or so and try sending a new message.
But even with some spammers are starting to retry, greylist is still >
a MAJOR antispam feature, which will block, in my experiences, more than
85-90% of all SPAMs received by the system.
Perhaps now that's the case, but give it a few months until all the spambots
out there start paying attention to deferrals and retrying. Greylisting may
be effective now, but it's only a matter of time before the spammers learn
to adapt, just like they have to everything else.
- Re: Should I use greylisting Mike Jackson
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