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Forged sender (Re: Router file naming convention)
On 11 Jan 2003 at 9:52, Vince Puzzella wrote:
From: "Vince Puzzella" <firstname.lastname@example.org>
Subject: Re: Router file naming convention
Date sent: Sat, 11 Jan 2003 09:52:08 -0500
> Is there anyway to get the zmailer smtp server to test for forged sender
> addresses at the MAIL FROM:<> phase?
> Essentially, I want to perform a DNS MX record query to verify that the
> source IP is a valid mail exchanger for the sender's domain.
Just note that you will reject a lot of legitimate mail. Outbound and inbound
mail relays MAY differ by many reasons. I.e: load spreading at big public
system; company affiliations using one domain, local outbound machines and
single central inbound MX; etc, etc. You may wish to investigate this message
properties as a real example.
The RFC2821 requirement "every mailsender must accept mail to @[ip.ad.dr.ess]"
is something different.
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