Over the past few weeks, Apple Mail has periodically been popping up a dialog that says "The POP server pop.att.yahoo.com rejected the password for user firstname.lastname@example.org and asks me to enter the password again. If I click the "remember in keychain" checkbox and enter the password via the dialog box, the dialog box just returns with the same message. Quitting Mail and relaunching it fixes things until 1 to 10 hours later when it happens again. Why does stupid SBC's server keep intermittently rejecting the password? I know it's the right password because it works for hours and sometimes days at a time. When I do try to input it again via the dialog box in Mail, why is it appearing that SBC rejects it and/or keychain won't retain it? From my past experience, calling SBC/AT&T as a Mac user with any kind of problem is far less than useless. That would be my absolute last choice in solving this. Any ideas?