Mailer problems

[Bob Funchess]

Our mailer was working just a few days ago but now it seems to be broken.
Outgoing mail works fine but incoming mail seems to be getting bounced
between our Iris and our forwarding host, as if the Iris thought it was
someone else...
The mail eventually gets rejected with "maximum number of hops exceeded".
How can I tell our machine to keep mail for "user at blumiris.chem.umr.edu"
instead of attempting to forward it somewhere else?  Please respond directly
via E-mail to THIS ADDRESS; the one on the Iris (that receives this mailing
list) won't work for obvious reasons. :(
                             < Bob | S090726 at UMRVMA.UMR.EDU | Funchess >
                                    University of Missouri - Rolla
Disclaimer:  If the university shared my opinions,
             would I have an ID like S090726 ???