filtering/process inbound email

[karlp at ourldsfamily.com]

Scenario:  At work, we use RH9/sendmail. We autofax documents from our
business system via modem. The software also can use email and
occasionally when an email fails, it is returned to the fax server 'user'
which is aliased to me.

There is a line in the email that says Submitted by: user

Is there a relatively easy way to parse any incoming/bounced email sent to
the fax server's email address and forward email to user?

TIA,

Karl