[ExchangeList] A user not receiving mail from :

I have a user that is complaining that she is not receiving mail from
BCI.NET, a-znet.com and a person at juno.com. When I do nslook's on the
domains in question, there setup looks OK to me. Can someone help as to
where/how to resolve this. 
I am running Exchange 2003 sp2 on Windows 2003 sp2 with IMF and reverse
DNS lookup.
 <<nslookup.doc>> 

Todd Lemmiksoo
Network Administrator

All-Mode Communications, Inc.
1725 Dryden Road
Freeville, New York  13068
(607) 347-4164 x440
1-877-ALLMODE  (toll free)
http://www.all-mode.com

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