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 not enabled on AuthSMTP accounts.
  • If you do wish to use SSL/TLS please login to the control panel and enable it on your account.
  • 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'
Exchange 2013 - Open Exchange Management Shell' to get list of send connectors

Step Two

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


Exchange 2013 - Disable Opportunistic TLS - Step 2 - Type 'Get-SendConnector' to get list of send connectors

Step Three

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

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

Exchange 2013 - Disable Opportunistic TLS - Step 3 - To disable Opportunistic TLS type 'Set-SendConnector -Identity

Step Four

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

    Get-SendConnector "AuthSMTP Connector"|fl IgnoreSTARTTLS

Exchange 2013 - Disable Opportunistic TLS - Step 4 - To confirm the change so that you can send email via AuthSMTP type 'Get-SendConnector

Step Five

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

Step Six

Step Seven (Optional)

Further Reading