email not downloading

Since installing NIS 2014 not all of my email is downloading from the mail server, on some email addresses I have 6 email addresses and there is a problem with 3 of them, I get the following error message.

 

"An unknown error has occurred. Account: 'info@genealogyprinters.com', Server: 'mail.genealogyprinters.com', Protocol: POP3, Port: 110, Secure(SSL): No, Error Number: 0x800C0133"

 

Help please

 

Thanks

Ron