messaging from your listserv

[Brent Taylor <btaylor@cit.mbc.edu>]

        I'm the network administrator at MBC.  I have been receiving for the
last 2 weeks 10-15 messages a day in the following format:

        <<< HELO unicorn.acs.ttu.edu
        <<< MAIL From:<wcenter@unicorn.acs.ttu.edu>
        <<< RCPT To:<mpetty@199.111.21.10>
        <<< DATA
        Connected to 199.111.21.10:
        >>> HELO cit.mbc.edu
        <<< 553 cit.mbc.edu host name configuration error
        554 <mpetty@199.111.21.10>... Service unavailable

        My user is mpetty and I believe she has been receiving listserv
messaging from wcenter.  What I need to know is how I go about getting this
particular messaging to go away!!!  Please advise as to what needs to be
changed, either on my end or within your listserv!!!

Thanks, 
English Brent Taylor
Network Administrator
Mary Baldwin College
Staunton, VA  24401
540-887-7150, phone
540-886-4022, fax