Windows Mail Certificate Error

Hey everyone

I’m new to Dreamhost, I’ve just set up my first email here. I’m attempting to add it to my Windows 8 Mail app, using the details in the “Email Client Configuration” guide.

When I have SSL on and try to connect, it says “To use this account, you need to install a digital certificate on this PC. Contact your system administrator for more info.”

Of course I can connect if I turn SSL off, but I’d be happy to have the security. How do I get past this?