We've been kicking the idea for some sort of integration in SM around at the office, you got my upvote! We already have this in our backlog for future features already. However, please if you would like to see this, upvote and draw attention. :)

Here's a thread from 2016 where this was suggested and discussed...

 

And here's a thread from 2017 where I suggested:

Unfortunately it's been on the list for several years and not much has been done.

I think it would be a good idea, but trying to figure out how to it would work best.

 

On my cPanel server I purchased a Let's Encrypt module that will update each domain's SSL cert it also makes it super easy to protect a customers website. It automatically updates the cert either every 30 or 60 days. So the users can create a cert for their domain.

 

On my mail server I one DNS name for all users to use the same incoming and outgoing DNS name for communications. This is one of several devices I use with my wild card SSL.

 

To me having the insurance of a paid cert is comforting but a free cert would be nice.