EXCHANGE SERVER 5.5 is not able send mail to external user.

nice2002 (nice2002)
EXCHANGE SERVER is able to receive email and send email to internal user,but is not able to send mail to external users (like user@yahoo.com), the error message is :
externalusername@yahoo.com on Sat, 16 Feb 2002 13:22:44 -0800
The recipient name is not recognized
The MTS-ID of the original message is: c=US;a=
;p=server domain name;l=EMAIL0202162122FCG5BB2J
MSEXCH:IMS:domain name:domain name:EMAIL 0 (000C05A6) Unknown Recipient
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any idea is appreciated!
(#370850@0)
2002-2-16 -05:00

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