Microsoft Exchange 2013 - SSL/TLS

Important Points

• These instructions assume you have already setup your AuthSMTP send connector in Exchange 2013 using the instructions on the Exchange 2013 setup page .

• Microsoft Exchange 2013 has a feature called 'Opportunistic TLS' which is enabled by default upon installation, this feature means Exchange 2013 will try to negotiate a secured SSL/TLS session wherever possible and encrypt the message.

• By default SSL/TLS is enabled on all AuthSMTP accounts and we strongly recommend that you use it.

• If you do not wish to use SSL/TLS you will need to take the following steps to disable this feature in Exchange 2013.

Step One

• Open the 'Exchange Management Shell'

Step Two

• Type the following command to get a list of all your send connectors

  Get-SendConnector

Step Three

• To disable 'Opportunistic TLS' you will need to enter the following command

  Set-SendConnector -Identity "AuthSMTP Connector" -IgnoreSTARTTLS $true

Step Four

• To confirm the change has been accepted you can enter the following command

  Get-SendConnector "AuthSMTP Connector"|fl IgnoreSTARTTLS

Step Five

• You should now be able to send messages via AuthSMTP without Exchange 2013 trying to negotiate a SSL/TLS connection.

Step Six

• Microsoft Exchange 2013 - Disable non-delivery reports (NDR / DSN)

Step Seven (Optional)

• If you wish to change the default port that Exchange 2013 will connect to AuthSMTP on to one of the alternative ports please see Exchange 2013 - Alternative Port .

Further Reading

• If you have questions specifically about configuring or troubleshooting Exchange 2013 please use the Official Microsoft Exchange 2013 Documentation - due to the complexities of Microsoft Exchange we can only provide basic troubleshooting advice.
• For help with the Exchange Management Shell please see the Microsoft documentation for Exchange 2013 Management Shell and specifically for the 'Mail flow cmdlets' please see Mail Flow Cmdlets .