Mail problem

Alright, when we try to send emails in house to each other they are not getting through.  We can send emails outside easily.  I called our people in control of outgoing mail and they say there is no problem.  I called to check on the incoming mail and they say there is no problem.  What do I need to check on the server or whatnot?  
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ThomasBallardITConnect With a Mentor Author Commented:
Its flippin spamcop, it keeps blacklisting us.
Umm, knowing what OS and mail software you are using will make solving this possible.

ThomasBallardITAuthor Commented:
Using outlook 2000 and the server is windows server 2003 and most our computers are xp.
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