Cyrus lmtp problem

[admin at dnsbg.com]

Hi,

I need urgent help regarding my mail server and mail delivery

I have install 
cyrus + postfix +pam-mysql and etc
with virtdomains: on
Sep 10 01:46:55 host cyrus/lmtp[13093]: verify_user(domain.com!user.name) failed: Mailbox does not exist
Sep 10 01:46:55 host postfix/lmtp[13092]: 559F56FCFB: to=<user at domain.com>, relay=mail.dnsbg.eu[/var/run/cyrus/socket/lmtp], delay=43, delays=43/0.06/0.03/0.1, dsn=5.1.1, status=bounced (host mail.domain.com[/var/run/cyrus/socket/lmtp] said: 550-Mailbox unknown.  Either there is no mailbox associated with this 550-name or you do not have authorization to see it. 550 5.1.1 User unknown (in reply to RCPT TO command))

but wil this option all mail user will have to be /domain/ a.b.c./user
i need to be a.b.c.d/user/user at domain.com

with virtdomains: off
Sep 10 02:01:29 host cyrus/lmtpunix[13244]: verify_user(user.admin) failed: Mailbox does not exist
Sep 10 02:01:29 host postfix/lmtp[13243]: 160196FCFB: to=<user at domain.com>, relay=mail.dnsbg.eu[/var/run/cyrus/socket/lmtp], delay=0.66, delays=0.49/0.02/0.04/0.12, dsn=5.1.1, status=bounced (host mail.domain.com[/var/run/cyrus/socket/lmtp] said: 550-Mailbox unknown.  Either there is no mailbox associated with this 550-name or you do not have authorization to see it. 550 5.1.1 User unknown (in reply to RCPT TO command))
i have create user -> user at domain.com 
Thanks in advance
help me pls. i have to move from old server!
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