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user1821484
Asked: 2013-02-25 04:46:36 +0800 CST

Is it possible to change Return-Path in Sendmail

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I just changed Return-Path in 2 of my servers which run Exim and Posfix. The third server runs Sendmail. I spent several hours trying to find information how to change it but can not find anything. So, I need to change Return-Path so that sent emails contain Return-Path: [email protected] instead of [email protected].

I can not change the server's hostname itself because my data center wants additional 5 EUR/month for a custom PTR record.

Thanks.

sendmail

2 Answers

  1. Best Answer

    I copy from the bat book:

    There must be only one Return-Path: header in any mail message, and it should be placed there by the site performing final delivery. This header should be declared in the configuration file like this:

    H?P?Return-Path: $g

    The ?P? flag ensures that only delivery agents that perform final delivery insert this header. Those delivery agents are usually prog and local, which usually contain an F=P delivery agent flag

    So if you want to set it to something else at the bottom of your sendmail.mc add the following lines:

    LOCAL_CONFIG
H?P?Return-Path: blah-blah

    Also note that if this header is already defined, then it cannot be replaced unless sendmail was compiled with H_ACHECK defined for conf.c.

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  2. https://web.archive.org/web/20161120105550/http://www.sendmail.com:80/sm/open_source/docs/m4/masquerading.html

    As I understand you look for FEATURE(`masquerade_envelope')
    [only "header sender"/"From:" is modified by default, other features extend it]

    P.S. If you want to keep "header sender"/"From:" unchanged AFAIR it possible with FEATURE(`genericstable').

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