John Levine via Postfix-users:
> I am trying to tidy up a complicated and messy postfix config that has
> all the issues you'd expect in one that has been twiddled by many
> people over a decade to handle multiple sort of related mail streams.

Auch.

> Today's issue is ensuring that we only do submission rewrites on
> outgoing mail, not incoming mail, e.g., adding Date and Message-ID.

This part is controlled with local_header_rewrite_clients which
defaults to permit_inet_interfaces (i.e. 127.0.0.1 etc.) , but
should also include permit_sasl_authenticated if you have remote
MUA agents.

https://www.postfix.org/postconf.5.html#local_header_rewrite_clients

> Maybe I'm having a senior moment, but what in the config says to do
> or not do that?  TIA.

This was added some 15 years into the Postfix life cycle, and as
a retrofit, not loudly advertised in the documentation.

        Wietse
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