Demi M. Obenour:
Checking application/pgp-signature: FAILURE
> When a message is submitted using postdrop, Postfix is obviously aware
> of which user submitted it, as it includes the UID in the Received:
> header. Is it possible to use this information in a canonical(5)
> table, or is a milter required?
>
> Thank you,
You mean the numerical UID that that is shown in a comment:
Received: by mail.example.com (Postfix, from userid 1001)
id 4C1dKq2WvyzJrNw; Wed, 30 Sep 2020 10:04:31 -0400 (EDT)
Postfix address rewriting is limited to headers that contain only
addresses: From:, To:, Cc:, Reply-To:, and the like. And address
rewriting never looks at the content of comments.
For everything else Postfix can only replace entire headers (through
header checks or milter header delete/insert actions).
Wietse
