[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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