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Exchange 2013 relay Failure / not authorized to use the server

Posted on 2013-05-29
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Last Modified: 2013-06-03
Have a windows service app which sends emails but and am getting the below errors;

Event Application Log:
The account '<Domain>\Administrator' provided valid credentials, but is not authorized to use the server; failing authentication.

WS Log:
Mailbox unavailable. The server response was: 5.7.1 Unable to relay

I have a receive connection set up with TLS and Exchange Users
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Question by:crundle32
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Expert Comment

by:James H
ID: 39204335
Can you try putting 'Anonymous Users' in the permissions group and try again.
Did you also only specify your internal IP range in the receive connector?
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Author Comment

by:crundle32
ID: 39204360
I have also tried TLS with and without the mutual Auth TLS with the anonymous. Getting same errors.
Scoping:  
IP Address: 10.0.5.2-10.0.5.200
Binding:
(All Available IPv4) 25

Should add this windows service is running on the Exchange service not a different machine.
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Accepted Solution

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crundle32 earned 0 total points
ID: 39204566
For others;
changed to port 2525, and set app to UseDefaultCredentials = True
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Author Closing Comment

by:crundle32
ID: 39215612
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