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5.7.1 client was not authenticated

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5.7.1 client was not authenticated - 28.Aug.2014 1:50:28 PM   
agavephil

 

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Joined: 28.Aug.2014
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I'm attempting to setup a vendor program to send email through our exchange server through a VPN. The VPN is set up, telnet to port 25 to the exchange server is working. When trying to send email through their web interface, I'm getting a 5.7.1 client was not authenticated error.

I have added a receive connector allowing access from their VPN address as well as their public IP address, so I'm running out of ideas as to what to check next.
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