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Emails rejected by BT

Posted on 2014-10-20
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Last Modified: 2014-11-01
Have a domain hosted by BT with several email accounts attached to it, all set up on my Exchange 2010 server & Outlook 2007 clients. In EMC under Organisation Config, Hub Transport has its Send connector set to send via smarthost ‘smtp.btconnect.com’. All was well for many months until Friday when suddenly all outgoing emails bounced within seconds with “The following organisation rejected your message: mail.btconnect.com #550 not permitted”. Took this up with BT who claim the smtp settings for this domain should be:
Server name: smtp.office365.com
Port: 587
Encryption method: TLS
I tried to explain Exchange had been set up the way it was all along and worked perfectly well until Friday but the technician insisted my configuration should not have worked and the only configuration which should have worked was the one he gave me above. But unless I’m missing something there isn’t anywhere in the Hub Transport settings to change the port number or specify TLS encryption
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Question by:laurencoull
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by:Enphyniti
ID: 40393191
You need to speak with another technician who can be honest with you or knowledgeable about what changed.

Or you can update your settings to what he told you and see if that works.

You need to use powershell to define the port on a smarthost.  This will be done with the get/set-sendconnector command as detailed here: http://forums.msexchange.org/Smart_Host_using_Port_587/m_1800467895/tm.htm
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Simon Butler (Sembee) earned 500 total points
ID: 40393239
BT are moving everything to Office365, and will no longer be running their own servers.
The address you had configured definitely did work, so I presume they have reached the point where it is now turned off.

It has been coughing out not permitted occasionally for years.

Do you have a static IP address? If so, get BT to set a PTR on the external IP address and send the email out directly. Otherwise if you don't want to send email out through the Office365 server then you will have to find another SMTP service to use.

Simon.
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