[KLUG Members] sendmail question

[Dirk H Bartley]

A particular customer of ours is spam blocking email sent to them from
us.  I believe after examining the headers of the messages that this is
being caused by the following in the header:
Return-Path: <vsifax@srvbai1.schupan>

This is coming from vsifax through an autosend directory feature so I
can not just add a -f option in a sendmail command line.  I've searched
the vsifax manual for a fix but have not found an appropriate tag.  Is
there a way to get sendmail to mangle the header to show a return-path
of an email address of my choosing with a valid domain?

Am I heading into inverse notation heck?

Dirk