Claude,

> I think, a very simple solution would be do include a special X-Header in
> the message coming from the receiving sendmail instance, in which one the
> IP address of the client would be included. sendmail can easily be
> configured in order to do this. Because this receiving sendmail instance is
> only in communication with amavisd, there should be no security problem.
> If necessary, amavisd could remove this special header.
> What is your opion, Mark ?

In a dual-MTA setup the client IP address is already available in a
Received header fields, so no extra header fields would be needed.
The trace parsing routine is already in the code (sub parse_received),
but would need to be invoked to find the topmost Received field. For 
concept-compatibility with SA, the SA mechanism on trusted/external
networks should probably be adopted, although this can be quite a
can of worms.

  Mark

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