If one looks carefully, RFC 5321 3.7.2 states:
"As another consequence of trace header fields arising in non-SMTP
environments, receiving systems MUST NOT reject mail based on the format of a
trace header field and SHOULD be extremely robust in the light of unexpected
information or formats in those header fields."
I'm not going to quote the whole RFC to you, but from what I've read it's
pretty clear that the Received: line is for debugging purposes ("... the most
important use of Received: lines is for debugging mail faults ...", Section
3.7.2). I'm hard-pressed to find any justification for blocking of mail
generated or handled by Exchange. In fact, I think it's pretty clear the RFC
states you MUST NOT block them.
---
Regards,
George
-----Original Message-----
From: mimedefang-boun...@lists.roaringpenguin.com
[mailto:mimedefang-boun...@lists.roaringpenguin.com] On Behalf Of
kd6...@yahoo.com
Sent: Wednesday, May 16, 2012 5:23 PM
To: mimedefang@lists.roaringpenguin.com
Subject: Re: [Mimedefang] X-Auto-Response-Suppress header
--- On Wed, 5/16/12, David F. Skoll <d...@roaringpenguin.com> wrote:
> After gnashing my teeth at Microsoft because its dumb software ignores
> Precedence: and List-*: headers and cheerfully sends out-of-office
> replies to list owners, I discovered this:
>
> http://msdn.microsoft.com/en-us/library/ee219609%28v=exchg.80%29.aspx
>
> I've set up a MIMEDefang filter to add X-Auto-Response-Suppress: OOF
> to all list traffic. Just passing it along as a tip to other list
> owners.
I take a stronger approach: Since M$ Exchange is incapable of generating
proper "Received:" headers, I reject all mail which has transited such a system
using that software.
If one looks carefully, their chosen syntax violates even the old RFC 821/822
standards (STD 10), let alone the 5321/5322 modern versions.
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