troubleshooting Question

error 5.1.0 unknown address and 550-5.7.1 unable to relay

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fanman8302Flag for United States of America asked on
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I have exchange 2007 I am getting error messages when I try to send emails to this domain and the error messages is 5.1.0 unknown address and 550-5.7.1 unable to relay  user@advancedaromatics.com  
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