[THIN] OT: Exchange 2000 relaying denied error

OK this problem is driving me up a wall, if anyone can help I'd sure
appreciate it. We've recently converted to an Exchange 2000 mail server
(from a Netscape Messenger server).  The install has gone fine, AD and
DNS all working as it should.  All anti-relaying option set properly (I
think). The problem: all Outlook Express clients in the company get a
550 5.7.1 relaying denied error when trying to send to an external mail
address.  Users using Outlook (97, 2000, 20002 in Corporate Mode)
,Netscape or Pegasus mail can send external mail fine. I've found
nothing in MS knowledgebase or on various exchange pages over the net.
Has anyone seen this issue? Any solutions? Thanks in advance,
 
--
Shawn Beairsto
Network Specialist/Web Developer
Data Kinetics Ltd.
Ottawa, Ontario CANADA
(613)523-5500 x224
http://www.dkl.com <http://www.dkl.com/> 

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