From: Wietse Venema (wietseporcupine.org)
Date: Tue Jul 01 2003 - 12:32:06 CDT

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Orlando Andico:
>
> hello,
>
> came across this on slashdot a while back:
> http://projects.puremagic.com/greylisting/
>
> very simple-minded, actually it's *simpler* than reject_unverified_sender.
> i suspect it would be very easy to add such a feature to Postfix. but
> before i use my mediocre coding skills to add such a feature, is there any
> effort underway to do this?

I've added it onto reject_unverified_sender. In simple terms, don't
accept mail from a sender for the first N seconds after it verifies
as OK. Code will go out some time in the next couple days.

The same could be done with the unfinished TCP lookup table. Just
reply "try again" for the first N seconds after a client or sender
hits your machine.

I'm not going to write code specifically for client+sender+recipient
greylisting.

Greylisting stops only certain forms of spam. It stops some spam
from open proxies, but not from open relays or from MTAs that are
set up to send spam.

        Wietse

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