When does MS insert envelope headers?

[Kai Schaetzl]

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I'm trying to troubleshoot a problem with spamassassin just flagging every 
message as SPF_FAIL. Investigating I noticed that I had told spamassassin 
to use the X-Envelope-To header for that purpose. However I had forgotten 
to tell sendmail or Mailscanner to add it. When I run the message manually 
thru spamassassin (with an added X-Envelope-To header) it produces a 
correct result. So I configured MS to add the header (and it does), but 
the problem persists.
Is it possible that MS adds the header only after the SA scan and SA gets 
the completely unaltered message?
If so, how do others assure that they get correct SPF results? Set the 
From: as envelope_sender_header?
BTW: this is MS 4.32.5, in case this problem has already been resolved in 
a later version.

Kai

-- 
Kai Schätzl, Berlin, Germany
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