> You mean:
>
> Received: by MTA-NAME
> Other headers added by the MTA named above.
>
> Versus:
>
> Other headers added by the MTA named below.
> Received: by MTA-NAME
Yes.
> Postfix already appends From/Date/Message-ID under its own Received:
> header. Placing Postfix's PREPEND headers under its own Received:
> header is not inconsistent with that.
Yes, but those are single-instance headers that pertain to the
message as a whole, unlike trace information that pertains to a
particular hop. Things like "X-Envelope-From" and various other
prepends are typically hop-specific information, can be prepended
multiple times, and their origin becomes ambiguous when placed
below "Received" by some MTAs and above by others.
The milter compatibility logic is a shame, it would have been far
better had milters always expected a local "Received" header and
optionally ignored everything starting with the top-most Received
header up, if/when verbatim remote content is desired.
As it is, we're workoing around a milter interface design error.
--
Viktor.
