>have a few ideas as to what could be happening but would you be able to post
>a log of the communication between either your app or the curl command line
>tool and the problematic server (with verbose output turned on
>CURLOPT_VERBOSE with libcurl or -v with curl) to see what is being sent back
>and forth and why the 501 is being returned - It will also make sure I am on
>the same page as you so to speak?

Please check the log as follows. Email sending machine has hostname
set to "&&&&&".
===========================LOG START===========================
* Rebuilt URL to: smtp://xxxx.yyyy.com:25/
* Hostname was NOT found in DNS cache
* Trying 192.168.1.100...
* Connected to xxxx.yyyy.com (192.168.1.100) port 25 (#0)
< 220 xxxx.yyyy.com Microsoft ESMTP MAIL Service, Version:
6.0.3790.4675 ready at Wed, 21 May 2014
> EHLO &&&&&
< 501 5.5.4 Invalid Address
> HELO &&&&&
< 501 5.5.4 Invalid Address
* Remote access denied: 501
* Closing connection 0
failed return code 9: Access denied to remote resource
===========================LOG END============================

Thanks and Regards
Tom
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Received on 2014-05-21