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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 '12 at 14:51

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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 '12 at 9:38
    
You could specify a regular expression: postfix.org/DATABASE_README.html#types –  Frederick Nord Nov 29 '13 at 12:24

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