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Exchange 2013 Relay issue to external e-mail addresses

Posted on 2013-12-17
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Last Modified: 2014-01-29
We have recently migrated from Exchange 2007 to Exchange 2013.  At this point both servers are up and running with just a couple of mailboxes on the 2007 server.  Role are listed below.
•      2007 Server – Mailbox, Client Access, Hub Transport
•      2013 Server – Mailbox, Client Access

Internally, we have an IIS server on the domain that support an intranet site.  This site can send e-mail both internally and externally.  After the migration external mail now generates this error:  Mailbox unavailable. The server response was: 5.7.1 Unable to relay
I have set up a receive connector following the documentation online, but I just can’t get external mail from this IIS server working.  Is there anything else I might need to do?  This worked just fine before the migration with the same receive connector rules.
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Question by:Blink_1976
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Stelian Stan earned 500 total points
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To create a Relay Connector on Exchange 2013 follow this article: http://exchangeserverpro.com/exchange-2013-configure-smtp-relay-connector/

If your relay connector is already setup double check your settings against that article. Make sure that the Ip Address of that IIS server is on "remote network settings" list.
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