My domain name is skiesthelimit2008.com.

I set up a few e-mail accounts on the cpanel. Then I went to set up Thunderbird to retrieve these accounts and ran into problems. I did everything the vid tutorials say and watched them several times. I used mail.skiesthelimit2008.com for pop3 and smtp. But when I go to get my mail, it tells me :failure to connect to server mail.skiesthelimit2008.com". I went to a friends house and when I connected to her WiFi Thunderbird tried to connect again and IT WORKED!! Thunderbird prompted me for a password like it is supposed to and everything was fine. As soon as I got home, I got the same failure message. Can anyone tell me what Im supposed to do? Is there some port number I've missed? How do I fix this?