Tobi via Postfix-users:
> Just wonder: why is the Message-ID header not seen by header_checks on
> the bounce?
The Message-ID header is added after Postfix has seen all headers,
and found that no Message-ID is present. An added 'missing' header
is not subject to header_checks, just like headers added with
header_checks actions.
Using header_checks to inspect headers added by header_checks actions
would be dangerous. So that is never going to happen.
Using header_checks to inspect added 'missing' headers would require
a new feature name (missing_header_checks?), to avoid a compatibility
break in the header_checks behavior.
Aa noted by Viktor, you could use milter_header_checks to inspect
a header added by a Milter.
Wietse
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