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Forcing TLS encryption with MS Exchange

This article describes how you can force TLS encryption with Microsoft Exchange.

Do as follows:

  1. Make sure that Exchange can handle inbound mail traffic with TLS. Establish a connection to the email server port 25. Run the following command: telnet youdomainhere.com 25:

    forcing_TLS_encryption1.png

  2. If you can see STARTTLS, Exchange is able to use TLS:

    forcing_TLS_encryption2.png

  3. Go to System > SMTP Encryption > Settings and set Enable TLS to On:

    forcing_TLS_encryption3.png

  4. Go to System > SMTP Encryption > TLS Settings and add your email server IP address to the list with following settings:

    forcing_TLS_encryption4.png