this is the error I keep receiving and then I get duplicate emails in my inbox that I already read/deleted

Unable to send or receive messages for the pop.mail.yahoo.com account. 

Server Error: 0x800CCC90
Server Response: -ERR [SYS/TEMP] problem retrieving message.
Server: 'pop.mail.yahoo.com'
Windows Live Mail Error ID: 0x800420CD
Protocol: POP3
Port: 995
Secure(SSL): Yes