[Greylist-users] Another idea for greylisting (fwd)

Evan Harris eharris at puremagic.com
Sun Jun 22 13:36:41 PDT 2003

I'm forwarding this message to the list.


---------- Forwarded message ----------
Date: Sun, 22 Jun 2003 08:52:33 -0400 (EDT)
From: David F. Skoll <dfs at roaringpenguin.com>
To: Evan Harris <eharris at puremagic.com>
Subject: Another idea for greylisting

Hi, Evan.

I had another idea for graylisting; I posted it on comp.mail.misc.  Here's
a copy for you to think about.



Bob O`Bob wrote:

>> unavailable addresses. Do you think this is true? Will spammers hold
>> failed delivery attempts and retry after a few hours?

> They most certainly will.  Within a few months, anyway.

But as someone else mentioned, widespread use of gray-listing has the
benefit of giving eveyone an hour to detect a mass-mailing.  Why not modify
the scheme as follows:

The very *first* time you see a new "relationship", do the tempfail after
the end of the DATA phase, and then you have the mail to inspect.  You
can then send it to DCC, Razor, etc.

For the next hour, you tempfail on the RCPT command (because you already have
the mail body), and after that you allow processing.

This gives Razor, DCC, etc. a one-hour headstart before anyone actually
gets any mail.


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