1) Sign into the top level admin account for the server you are working with.

2) Click the Setting tab in the top left corner of the screen then click Bindings.

3) Click Ports then find and select port 25.

4) Pop down the Encryption dropdown box and click StartTLS.

5) Update the name of the port to add "StartTLS" at the end then enter the path to the SSL certificate for the server along with the SSL password.

6) Click the IP that you want to bind to then click Save.

7) Repeat steps 3-6 for ports 110, 143, and 587.

8) To add some ports for SSL/TLS, click New then pop down the Encryption dropdown and click SSL/TLS.

9) Update the name of the port to add "StartTLS" at the end then enter the path to the SSL certificate for the server along with the SSL password.

10) Click the IP that you want to bind to then click Save.

11) Repeat steps 8-10 for POP and IMAP. To change the protocol, pop down the Protocol box and select the one needed.