Response: 421 50 users (the maximum) are already logged in, sorry
There was a problem logging onto your mail server. Your Password was rejected. Account: 'mail.MYSITE.co.uk', Server: 'mail.MYSITE.co.uk', Protocol: POP3, Server Response: '-ERR [IN-USE] Internal login failure. Refer to server log for more information.', Port: 110, Secure(SSL): No, Server Error: 0x800CCC90, Error Number: 0x800CCC92