Le 18/09/2025 à 16:08, R. Diez via Postfix-users a écrit :
Or may be there is some ready-to-use script which automatically replaces
both the envelope address and the "From:" header to match the ones
associated with the SMTP account, but only for those SMTP accounts
listed in some configuration file? This way, not every hoster must
implement it all from scratch.
Hi,
I've been looking for something like that for a while and ended up
writing my own milter this week.
It behaves as described above: it uses an "identity database", which is
a text file that lists every account and the email addresses and display
names they are allowed to use.
If an emails is received where the envelope from or header From: doesn't
match what the user is allowed to use, the offending sender info gets
rewritten.
It rewrites both the email addresses as well as the display name in the
From: header of the message.
The thing has been running for a few days on my low-traffic system. It
seems to work okay, but it could definitely benefit from more testing,
as there are probably corner case that I haven't encountered.
So if anybody is interested, you can get it at
https://github.com/antoninverrier/milter-enforce-sender
This milter can be used in "dry run" mode, where it doesn't actually
rewrite sender info but just add debugging headers.
Looking forward to feedback.
Thanks,
Antonin
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