Sieve filter for Return-Path header

[Baltasar Cevc]

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Hi David,

| I am trying to use a simple sieve filter to handle backscatter
| e-mails. If the return path is "empty" (i.e., just <>), then I
| want to file it into a different folder:
I'm not totally sure, but I think that the return-path is inserted after
the sieve filtering.
For example your mail's headers contain:
~ Return-Path: <owner-info-cyrus at lists.andrew.cmu.edu>
~ Received: from mail.juz-kirchheim.de (cyrus.juz-kirchheim.de
~        [10.111.222.4])
	by cyrus.juz-kirchheim.de (Cyrus v2.1.13) with LMTP;
~        Thu, 30 Dec 2004 06:02:38 +0100
~ X-Sieve: CMU Sieve 2.2


It should contain the envelope addresses - so you should try to check
the envelope sender adress. The example from the RFC for envelope
tests is:
~ require "envelope";
~             if envelope :all :is "from" "tim at example.com" {
~                discard;
~             }
So it would probably be
... if envelope :all :is "from "" { ...

Hope that helps,
Baltasar
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