1. Login to your WHM Cpanel, you will have to be in root level
4. Purchase an SSL certificate with CA root certificate. If you are interested you can buy the SSL certificate with IP SERVER ONE Solutions, our SSL provider is Alpha SSL.
5. Then, back to CPanel, at the left side panel, go to “Manage SSL Certificates”. Check on the options Exim and Dovecot, then insert all the certificate details in the blank field.
6. After that, you need to enable port 465, 993, 995 in exim. 465 is secure outgoing SMTP port 993 is secure incoming IMAP port 995 is secure incoming POP3 port Click save at the bottom of the page afterwards.
7. Your SSL on mail services is ready now. You can verify using Checktls