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From: Razvan Cosma on 27 May 2010 17:54
Hi everyone,
I am trying to get message bounces/delays piped into a script while keeping
the user-visible From: header intact. To do this, I have asked the senders
to relay through me and include a header of the form X-bounces-to:
scriptalias(a)mydomain.com. In the postfix relay host I added
main.cf:
header_checks = regexp:/etc/postfix/header_checks
header_checks:
/^Return-Path: (.*)/ REPLACE X-Original-Return-Path: $1
/^X-bounces-to: (.*)/ REPLACE Return-Path: $1
The log does say
postfix/cleanup: replace: header X-bounces-to:
scriptalias(a)mydomain.comfrom somehost[1.2.3.4]; from=<
zzz(a)domain1.com> to=<aaa(a)domain2.com> proto=SMTP: Return-Path:
scriptalias(a)mydomain.com
which sounds a bit odd - is this a concatenation of several informations
from the message headers or some error on my part?

The messages do go out with the wrong return-path - the address used in the
MAIL FROM: line, in this case zzz(a)domain1.com. My question would be: does
cleanup(8) do another replace of the headers just before the message leaves
the system? If so, can it be disabled?
From: mouss on 27 May 2010 18:19
Razvan Cosma a écrit :
> Hi everyone,
> I am trying to get message bounces/delays piped into a script while
> keeping the user-visible From: header intact. To do this, I have asked
> the senders to relay through me and include a header of the form
> X-bounces-to: scriptalias(a)mydomain.com
> <mailto:scriptalias(a)mydomain.com>. In the postfix relay host I added
> main.cf <http://main.cf>:
> header_checks = regexp:/etc/postfix/header_checks
> header_checks:
> /^Return-Path: (.*)/ REPLACE X-Original-Return-Path: $1
> /^X-bounces-to: (.*)/ REPLACE Return-Path: $1
> The log does say
> postfix/cleanup: replace: header X-bounces-to: scriptalias(a)mydomain.com
> <mailto:scriptalias(a)mydomain.com> from somehost[1.2.3.4];
> from=<zzz(a)domain1.com <mailto:zzz(a)domain1.com>> to=<aaa(a)domain2.com
> <mailto:aaa(a)domain2.com>> proto=SMTP: Return-Path:
> scriptalias(a)mydomain.com <mailto:scriptalias(a)mydomain.com>
> which sounds a bit odd - is this a concatenation of several informations
> from the message headers or some error on my part?
>
> The messages do go out with the wrong return-path - the address used in
> the MAIL FROM: line, in this case zzz(a)domain1.com
> <mailto:zzz(a)domain1.com>. My question would be: does cleanup(8) do
> another replace of the headers just before the message leaves the
> system? If so, can it be disabled?
>

You must understand the difference between the "envelope" and the
"headers". The MAIL FROM command specifies the _envelope_ sender. The
fact that this gets written into the Return-Path header is a good thing,
but it happens at delivery time (and it is optional. see the manpage of
"pipe"...).


to play with the sender address, use smtp generic maps. but better set
the correct sender address at the time the message is sent. users can do
"sendmail -f $sender...". This is better than relying on headers. and it
follows an old principle: fix problems near the source.

From: Wietse Venema on 27 May 2010 19:26
Razvan Cosma:
> /^Return-Path: (.*)/ REPLACE X-Original-Return-Path: $1
> /^X-bounces-to: (.*)/ REPLACE Return-Path: $1

The Return-Path: header DOES NOT CONTROL delivery of bounce messages.

Instead, bounce messages are sent to the envelope sender address
(the address in the MAIL FROM command).

Wietse

From: Razvan Cosma on 28 May 2010 05:14
Hi - understood. Now, as the messages are received from other hosts, I can't
change the MAIL FROM part of the conversation. Also, as they are sent from
..net (using system.net.mail) the sender application can't change the
envelope sender without changing the From: line too (it's a limitation of
that class). The alternatives now are to
1. not use system.net.mail, and write another smtp class in .net
2. somehow make postfix insert a header that makes other mailer-daemons
bounce NDRs/out-of-offices/etc to it, instead of the From: address.
#1 is far from trivial for various reasons, so any hints towards #2 would be
very helpful

On Fri, May 28, 2010 at 2:26 AM, Wietse Venema <wietse(a)porcupine.org> wrote:

> Razvan Cosma:
> > /^Return-Path: (.*)/ REPLACE X-Original-Return-Path: $1
> > /^X-bounces-to: (.*)/ REPLACE Return-Path: $1
>
> The Return-Path: header DOES NOT CONTROL delivery of bounce messages.
>
> Instead, bounce messages are sent to the envelope sender address
> (the address in the MAIL FROM command).
>
> Wietse
>
From: Wietse Venema on 28 May 2010 06:06
Razvan Cosma:
> Hi - understood. Now, as the messages are received from other hosts, I can't
> change the MAIL FROM part of the conversation. Also, as they are sent from
> .net (using system.net.mail) the sender application can't change the
> envelope sender without changing the From: line too (it's a limitation of
> that class). The alternatives now are to
> 1. not use system.net.mail, and write another smtp class in .net
> 2. somehow make postfix insert a header that makes other mailer-daemons
> bounce NDRs/out-of-offices/etc to it, instead of the From: address.
> #1 is far from trivial for various reasons, so any hints towards #2 would be
> very helpful

Postfix has a HUGE document on address rewriting (headers and
envelopes). Try "postfix address rewriting" in your favorite
search box.

Wietse

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