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I've recently set up an exchange 2003 server and pointed my external DNS records to my external IP. I have checked with my domain service provider and they have confirmed that the settings are correct. From a user account on my internal domain I can send emails to external addresses fine, however when external emails try to send to the email the following error bounces back:

550 550 5.7.1 unable to relay. State 14

Any suggestions anyone? Thanks.

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up vote 6 down vote accepted

Have you configured your Recipient Policy to be authorative for the domain in question? If not, you need to do that.

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Whole in one - thanks guys. – The Woo Aug 6 '10 at 4:35
Glad to help... – joeqwerty Aug 6 '10 at 11:22

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