Mailing List Message #10437
From: Tod Fitch <>
Subject: Re: smart SIMS - but how?
Date: Mon, 11 Mar 2002 18:34:05 -0800
To: SIMS Discussions <>
At 8:21 PM -0500 3/11/02, Bill Cole wrote:

No, you missed it. SIMS  does no reverse lookup at all. It does a query for an A record for the name claimed by the sender, and sees if it matches the connecting IP.

It looks to me like SIMS is doing a MX lookup on which yields a result of: preference = 2, mail exchanger = preference = 10, mail exchanger =

Since there is an MX record for the sender is "verified". I don't think SIMS digs deeper to see that the A record for is not valid.
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