MMDF Problem

[Ralf U. Holighaus]

We have several MMDF systems under SCO Unix 3.2.2 installed. One of them
uses the modem and is being used as intelligent mail server with all
domains etc.

The others just know their local users; the rest is forwarded via the
badhosts channel to the intelligent MMDF server. It works find, all mail
reaches it's destination, but the intelligent MMDF server replaces the
>From line (not the From: line!) with 'postmaster', so that no reply is
possible.

Does anybody familiar with the MMDF system know how to switch off this
from line replacement? 

I don't want to install all the mail routing information on all other 
systems; the central mail server is fine AND is being proposed by SCO
in the MMDF configuration guide!!!

Regards

Ralf.