Optimum online email will not open on new macbook pro?

I just got my macbook pro and i was trying to set up my optimum email. It wasnt working in the mail setup on my mac so i tried to log onto the optimum online site to make sure it was the right logon and password. I logged onto the account but once i clicked "mail", the browser would not load any further. When i try to setup my email, this shows up:

Logging in to the optonline.net POP server “mail.optonline.net” failed. Make sure the user name and password you entered are correct, then click Continue. If the information isn’t correct, you cannot receive messages.

Help?