[Mimedefang] Re: Great open letter about anti-virus, emails, bounces, etc.
David F. Skoll
dfs at roaringpenguin.com
Mon Sep 15 15:44:01 EDT 2003
On Mon, 15 Sep 2003, Matt Cramer wrote:
> It is amazing how much spam stops once you only accept aol.com, yahoo.com,
> etc. mail from hosts which reverse resolve to something in those domains.
Our CanIt marketing literature calls these rules "Mismatch Rules" and
they are very effective for selected domains. I suggest allowing
a set of matches -- for example, it's legitimate for mail from
"foo at aol.com" to come via a paypal.com server.
For example:
>From aol.com OK-Relays = aol.com, paypal.com
>From msn.com OK-Relays = msn.com, hotmail.com, paypal.com
etc...
Regards,
David.
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