relay problem ?

hi guys,
i'll try send emial for someone at  but it has returned to me.  
then i try to send via telnet, and got this error (like on returned email) :

220 win2 Microsoft ESMTP MAIL Service, Version: 5.0.2195.6713 ready at  Tue, 26
Aug 2003 02:56:49 -0700
250 win2 Hello []
mail from: hery@xxxxxxxxxxxxxx
250 2.1.0 hery@xxxxxxxxxxxxxxxxxxxxxxxx OK
rcpt to: info@xxxxxxxxxxxx
550 5.7.1 Unable to relay for info@xxxxxxxxxxxx
500 5.3.3 Unrecognized command
221 2.0.0 win2 Service closing transmission channel

what make this error occured ?  


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