Problem with fetching mail

[abuzaind]

When I connect to pop3, I get the message about failed login.

The except from mail.log:

Code:

Feb  8 20:10:45 vps courierpop3login: Connection, ip=[::ffff:XX.XXX.XXX.XXX]
Feb  8 20:10:45 vps courierpop3login: LOGIN: ip=[::ffff:XX.XXX.XXX.XXX], command=CAPA
Feb  8 20:10:50 vps courierpop3login: LOGIN: ip=[::ffff:XX.XXX.XXX.XXX], command=USER
Feb  8 20:10:50 vps courierpop3login: LOGIN: ip=[::ffff:XX.XXX.XXX.XXX], command=PASS
Feb  8 20:10:50 vps courierpop3login: LOGIN: ip=[::ffff:XX.XXX.XXX.XXX], username=test@XXXXXXXXX.net
Feb  8 20:10:50 vps courierpop3login: LOGIN FAILED, user=test@XXXXXXXXXX.net, ip=[::ffff:XX.XXX.XXX.XXX]
Feb  8 20:11:01 vps courierpop3login: Disconnected, ip=[::ffff:XX.XXX.XXX.XXX]

I tried also to send a mail message to this mailbox. Here's except from mail.log about this action:

Code:

Feb  8 20:10:38 vps postfix/smtpd[11731]: NOQUEUE: reject: RCPT from XXXXXXXXXXX.net[XX.XXX.XX.XXX]: 550 5.1.1 <test@XXXXXX.net>: Recipient address rejected: User unknown in virtual mailbox table; from=<***@******.ua> to=<test@XXXXXXXX.net> proto=ESMTP helo=<XXXXXXXXXXXX.net>

Where should I look for a solving?

Thanks!