Home Forums Networks & Cross-Platform Networking Can't retrieve mail

For about a week I have been unable to retrieve my email. I use Mail and (try to) connect to ATT/Yahoo. I get the message "The POP server “pop.att.yahoo.com” rejected the password for user..." Which gives me a blank box in which I re-enter my password. That fails and the message appears again, with the box blank again. Ad infinitum. I googled the problem and others have had it.