As http://www.ds.fh-koeln.de/~marian/mozilla_bugs/pop3auth_1.gif shows, I have a mail account labeled "email@example.com". When I try to connect to this account and check mail, I get the dialog "Enter your password for firstname.lastname@example.org". To me the two labels seem not to be related to each other. In my opinion it would make sence to send this message: "Please enter your password for the account email@example.com." In order to give more verbose information, the text could also contain: "user name: marian server address: 126.96.36.199"