>I found (at least) one userid within the *SENATE.GOV domain.
>It had a host name of BOND.  When doing a
>
>         dig bond.senate.gov mx
>
>it pointed to the gateway.senate.gov.
 
   Okay, I've started looking into this address.  I'm fairly certain
   that this subscriber was not on the list when the error message
   first started occuring (either that or I feel like a real idiot
   for overlooking him).  Anyway, I'd like to thank everyone for the
   help.
 
                                                Brad Samek
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