Forcing TLS encryption with MS Exchange

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Forcing TLS encryption with MS Exchange - F-Secure Community

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

Do as follows:

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
```
:
If you can see STARTTLS, Exchange is able to use TLS:
Go to System > SMTP Encryption > Settings and set Enable TLS to On:
Go to System > SMTP Encryption > TLS Settings and add your email server IP address to the list with following settings: