Whilst logged in via Vop Mail Web you shall not be able to check
your mail box via a email client. It is important that you always log
off either by clicking the log off icon or visiting another web page
(as this automatically logs you off). For security purposes the
mailbox is locked until you log off. A typical error message may look
like
There was a problem logging onto your mail server. Your Password
was rejected. Account: 'user@domain.com', Server: '207.174.231.81',
Protocol: POP3, Server Response: '-ERR unable to lock user's mailbox
directory (183)', Port: 110, Secure(SSL): No, Server Error:
0x800CCC90, Error Number: 0x800CCC92