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Exchange 2010 550 5.7.1 Unable to relay

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!
1 Solution
Hendrik WieseCommented:
Have you created a relay connector?

Please see link below:
How to Configure a Relay Connector for Exchange Server 2010
You wont be able to use telnet to send mails using the default send connector. It requires an authentication! This is by design. You still should be able to send mails to your internal organization using RCPT TO: someaddress@mydomain.com and the error should not appear.

As Hendrik said, creating a new send connector will allow you to define some network hosts-range that are able to relay emails to external domains without authentication. This requires a new IP on the server for this connector.

r3helpdeskAuthor Commented:
Thanks for your reply, this is the solution.

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