well firstly i'd tell you to look in your mail logs, normally located in /var/log/maillog, if that dosn't help post them here.
now i'll need some more information, what OS are you using, what is your pop3/imap server? what webmail system are you using? Are you trying to login with a local user or a virutal user? are you trying to use root? have you tried reseting your password just incase you had caps on when you entered it? 'sudo passwd username' have you added a new user and tried to login with that user?
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