SMTP: helo != ptr? -- PCTECH

Subject: SMTP: helo != ptr?
From: David Gibbs <david@xxxxxxxxxxxx>
Date: Mon, 16 Nov 2009 09:22:58 -0600
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I just observed a slightly odd smtp conversation from my mail server to another ...

220 R2D2.example.com ESMTP ready at Mon, 16 Nov 2009 10:13:40 -0500

EHLO mail.midrange.com

250-R2D2.example.com
250-SIZE 20480000
250 8BITMIME

MAIL From:<bpcs-l-bounces+user=example.com@xxxxxxxxxxxx> SIZE=4201

421 R2D2.example.com has refused your connection because your HELO string did not match your PTR record

QUIT

I'm curious ... does anyone know of a RFC or other requirement that specifies that the helo host value match the PTR dns value?

Or is this just an overly aggressive mail admin?

I can understand where a PTR record might be required.

david

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Follow-Ups:

Re: SMTP: helo != ptr? , Lukas Beeler

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