How to rewrite completly the sender of all outbound mail in sendmail?

André Nasturas

12/26/23, 2:57 PM

How to set an arbitrary sender and name and address in the From field of every email sent via sendmail, ignoring any sender information already set, replacing original.sender <[email protected]> by Noreply <[email protected]> whatever original.sender and host.tld are ?

For context, the mails are sent by a java application using simplejavamail library, which sets variable sender names and addresses which needs to be dismissed. Changing the application is not an option.

I tried several configurations without success :

My best try so far is adding the following instructions in sendmail.mc :
```
LOCAL_RULE_1
R $*    $@ noreply <@domain.tld>
```
Actually, this does not rewrite the whole From field, but only the address part : [email protected] <[email protected]>
Any other R rule ended in the wanted sender set only in the left side of the address : [email protected] <[email protected]@host.tld>
H commands, like HFrom:[email protected], does nothing.
HReply-To:[email protected] actually adds the original sender address in the Reply-To header.
I even asked tips to ChatGPT who proposed to use G and S commands alongside R, but I think it is confused with something else as it does not work at all and I did not found any documentation about that.
I also tried MASQUERADE feature, but it require a list of masqueraded domains, while I need it to work for any domain. Wildcard seems not to be allowed there.
Finally I tried genericstable, but as for MASQUERADE, it seems I can't wildcard domains.

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