Hi ATCALLIED,
Thanks for posting your question. I'm more than happy to assist you. Emails are stored on the server in plain text. There is no methodology in place to encrypt the emails while they are stored.
You can set up your email client to use the shared SSL on the server, however, this just secures the connection to the server and not the emails themselves. Here's an article on using SSL with email.
Email configuration over SSL
If you need further assistance please feel free to contact us.
Thanks!
Tim S