Mail Unable to send messages

I've been using MobileMe lately, but I want to be able to make use of a few Smart Mailboxes and can't seem to get them synced on it. Therefore, I've been trying to use Mail.

Every other feature works, but when I try to send messages, it give me the message

"Mail was unable to connect to server “smtp.me.com” using SSL on port 587. Verify that this server supports SSL and that your account settings are correct."

This happened to me when I got my first computer, but I just started using MobileMe and left it alone. I've already checked the Support on the Apple website, and none of the things they suggested there were helpful, so I'm hoping there will be some more help here.