- Plesk for Windows
How to force SSL connections in MailEnable?
Connect to the server using RDP.
Open MailEnableAdmin in Start > Mail Enable > Mail Enable.
Go to Servers > localhost > Services and Connectors > SMTP > Properties > Inbound, click Settings... in the Port Settings section and check Requires SSL under port 25:
Also, in this menu SSL can be forced on the port 587 and any other additional port in the Additional Ports section.
Warning: Force SSL on port 25 at your own risk according to the following warning in MailEnable: