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I am using Postfix as a gateway for my domain and need it to change or rewrite the Envelope From address to match the From header. For example, the From: header is "joe@domainA.org" and the Envelope From is "bob@domainB.com". I want Postfix to make the Envelope From "joe@domainA.org" before relaying it on. I took a look at the Postfix Address Rewriting document but couldn't find anything that matched my use case.

(In case you're curious why I need to do this: Gmail uses the same Envelope From when sending from a particular account, no matter which From: address you choose to use. I would prefer not to disclose the account being used to send the email. Also, it messes with SPF/DMARC domain alignment - see 4.2.2 of the DMARC draft spec.)

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  • It would be helpful if you could give some examples. So what the headers currently look like and what you're trying to get them to look like.
    – webtoe
    Mar 13, 2012 at 14:51
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    did you ever find a working solution for your problem? I have the same question and for much the same reasons...
    – gogoud
    May 10, 2016 at 14:45
  • I've been wrestling with this for hours tonight, winding up in all kinds of corners of the Internet, trying to figure out how to do this. Literally all I want to do is make Postfix take the From address, whatever it is, and pass it along during sending such that the Return-Path is the same. It seems to be utterly impossible, though I would love to be proved wrong.
    – dgw
    May 28, 2016 at 7:57
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    wow, 5 years ago, no real answer, and I'm in the same boat now :( May 20, 2017 at 19:25
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    How about 9 years later :-(
    – koma
    Aug 26, 2021 at 11:23

1 Answer 1

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I believe you want "sender_canonical_maps" (and "recipient_canonical_maps" if you want inbound mail to be translated backwards):

http://www.postfix.org/postconf.5.html#sender_canonical_maps

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  • As far as I can tell, this only implements a table lookup. However, there might be several different From header addresses used with the same Envelope From address, so the table needs to act somewhat dynamically. Is there a variable for the From header address that can be used for the result?
    – lid
    Mar 23, 2012 at 9:38
  • You could specify a regular expression: postfix.org/DATABASE_README.html#types Nov 29, 2013 at 12:24
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    I don't see a way to do the rewriting dynamically, specifically to rewrite the envelope address based on the 'From:' address - even using regex or pcre tables...
    – gogoud
    May 10, 2016 at 14:46

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