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> I've got an email client (KeyMail, part of KeySoft, a specialised
> client in the BrailleNote note-takers for the blind) that fails
> rather gracelessly when messages don't have Message-Id: fields.
> Being a purist, I *really* don't want to add any headers on mail
> received from outside, but I must have Message-Id: in this case.
> Unfortunately, only always adding missing headers is an option in
> main.cf, but that adds From/Sender/Resent-* as well as the
> (acceptable) Date: and Message-Id: (To: is controllable separately).
> Is there any way to uniquely control each header? Or am I going
> to have to just lump it and always have a From: header derived
> from the system accounts or envelope sender?
You could add this at mailbox delivery time (procmail for shell
users, sieve for Dovecot, Cyrus IMAP, etc.). Postfix is not meant
to compete with these features.