You can try going to https://www.ssllabs.com/ to check SSL certificate installation issues and fix them. They'll give your configuration a quick look and see if they can spot your issue. Or, you could try generating a new SSL for your domain: from SSL For Free ... I use the "Let's Encrypt" authority for serving my web pages as HTTPS ... but I do not really know If a MX record can be set up after you install one of these. I'll bet it CAN. These genuine SSL Certs are indeed FREE: https://www.sslforfree.com/ Many Hosting Plans that have a cPanel DO Have Support for Free "Let's Encrypt" Certificates. Look in your cPanel for the "Security" section. (See screenshots below) Try "SSL/TSL Status" and "SSL/TSL" sub panels. You can paste in a certificate in the Certificates (CRT) Area ... Generate, view, upload, or delete SSL certificates. I think it was when I looked in the "SSL/TSL Status" panel for the first time that I found shiny new SSL Certificates waiting for me to use them. I did "HSTS" to force HTTPS on all pages ... after I merely flipped the switch, to activate them ... and I was HTTPS from then on.