Re: [swinog] Broken SPF Check implementation in Microsoft Exchange Forefront?

2013-12-02 Diskussionsfäden Klaus Ethgen 
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Hi,

Am Mo den  2. Dez 2013 um 16:54 schrieb Benoit Panizzon:
 Today, I discovered, that emails whose envelope sender matched the DNS SPF 
 record, but whose From: Header did not (like after the envelope sender has 
 being rewritten by SRS) were rejected by a hosted exchange server provider.
 
 I got in contact with that admin and he told me that this was the way the SPF 
 check works in the Microsoft Exchange Forefront Server.
 
 Well, according to the RFC 4408 only HELO or MAIL FROM are being considered 
 for SPF. Not the From: header.
 Is there anyone out there who can confirm, that Microsoft Exchange Forefront 
 Server realy has such a broken SPF implementation. Or did the exchange admin 
 just misconfigure his server?

Yes, this is a common fact that microsoft does this wrong.
Unfortunately the responsible admins are even worse and try to tell
you that this is from microsoft, that is a correct behaviour. You
always have to work around this.

I had one of this issue in Univerity too.

Regards
   Klaus Ethgen
- -- 
Klaus Ethgen  http://www.ethgen.ch/
pub  4096R/4E20AF1C 2011-05-16   Klaus Ethgen kl...@ethgen.de
Fingerprint: 85D4 CA42 952C 949B 1753  62B3 79D0 B06F 4E20 AF1C
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Re: [swinog] Broken SPF Check implementation in Microsoft Exchange Forefront?

2013-12-02 Diskussionsfäden Marc SCHAEFER 
On Mon, Dec 02, 2013 at 05:20:25PM +0100, Klaus Ethgen wrote:
 I had one of this issue in Univerity too.

same in the cantonal mail server ne.ch.

customer had to hack a pipe to a procmail to change the enveloppe so
that a simple mail reflector works.



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Re: [swinog] Broken SPF Check implementation in Microsoft Exchange Forefront?

2013-12-02 Diskussionsfäden David Schweikert 
Hi Benoit,

On Mon, Dec 02, 2013 at 16:54:59 +0100, Benoit Panizzon wrote:
 Today, I discovered, that emails whose envelope sender matched the DNS SPF 
 record, but whose From: Header did not (like after the envelope sender has 
 being rewritten by SRS) were rejected by a hosted exchange server provider.

Could it be that a DMARC policy is defined for the domain in the From:
header? With DMARC the From: header is checked too.

Cheers
David


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