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Have you created a relay connector?<br />
<br />
Please see link below:<br />
<a href="http://exchangeserverpro.com/how-to-configure-a-relay-connector-for-exchange-server-2010" rel="ugc">How to Configure a Relay Connector for Exchange Server 2010</a>
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Thanks for your reply, this is the solution.
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Hello guys!<br />
<br />
On a &nbsp;SBS 2011, using Exchange 2010, when I do a mail test with telnet I receive the following error: &quot;550 5.7.1 Unable to relay&quot;.<br />
<br />
Any idea?<br />
<br />
Thank you!
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Hello guys!

On a  SBS 2011, using Exchange 2010, when I do a mail test with telnet I receive the following error: "550 5.7.1 Unable to relay".

Any idea?

Thank you!

Exchange 2010 550 5.7.1 Unable to relay

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.