[Dovecot] Mailbox usage

[Andrew Velikoredchanin]

I use dovecot-0.99.11 from RHEL4.

dovecot-mysql.conf:
===
db_host = dbhost
db_port = 3306
db = db
db_user = dovecot
db_passwd = pass
default_pass_scheme = PLAIN
password_query = SELECT password FROM users WHERE username = '%u'
user_query = select maildir AS home,u_id AS uid,g_id AS gid from users 
WHERE username = '%u'
===

When I try "telnet localhost 110" and enter test login, I get in errorlog:
===
dovecot-auth: Jun 06 07:21:49 Info: MySQL: Performing query: SELECT 
password FROM users WHERE username = 'andy at domain'
dovecot-auth: Jun 06 07:21:49 Info: MySQL: Performing query: select 
maildir AS home,u_id AS uid,g_id AS gid from users WHERE username = 
'andy at domain'
pop3-login: Jun 06 07:21:49 Info: Login: andy at domain [::ffff:127.0.0.1]
dovecot-auth: Jun 06 07:21:49 Info: Login process 9 disconnected
dovecot: Jun 06 07:21:49 Fatal: chdir(/var/mail-domain/andy at domain) 
failed with uid 506: Not a directory
dovecot: Jun 06 07:21:49 Error: child 19446 (pop3) returned error 89
===

I think, dovecot use "/var/mail-domain/andy at domain" as maildir - not as 
mailbox.

What need set in dovecot config for work with mailbox?

Thanks.

-- 
Best regards, Andrew Velikoredchanin