That message is exactly what a pop server will tell you if your username/password is incorrect - it probably is. There are three AUTH_METHODs for a POP3 server from memory - if the username and pass are really correct try changing that to (probably) BEST or perhaps APOP...depends on what is driving the login.
First as a sanity check make sure you can actually connect from that box using telnet straight into the POP3 box:
$ telnet mail.somesite.com 110
Connecting to mail.somesite.com....
+OK POP3 v2001.78rh server ready <5efa.3eb25bc1@mail.someite.org>
USER <username_goes_here> [Enter]
+OK User name accepted, password please
PASS <password_goes_here> [Enter]
-ERR Bad login
PASS <correct_password!> [Enter]
+OK Mailbox open, 250 messages
QUIT [Enter]
+OK Sayonara
Connection to host lost.
$
You need to type in the alternate lines which is your half of the server dialog. No angle brackets! Note the standard error message if you put in the wrong password.
cheers
tachyon
s&&rsenoyhcatreve&&&s&n.+t&"$'$`$\"$\&"&ee&&y&srve&&d&&print
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