oh thank you for your valuable advise,
[root@mail mysql]# postmap -v -q maniji@xxx.net mysql:./sender_login_maps.cf
postmap: dict_eval: const mail
postmap: dict_eval: const ipv4
postmap: dict_eval: const
postmap: dict_eval: const
postmap: dict_eval: const
postmap: name_mask: ipv4
postmap: dict_eval: const mail.xxx.net
postmap: dict_eval: const xxx.net
postmap: dict_eval: const Postfix
postmap: dict_eval: expand ${multi_instance_name:postfix}${multi_instance_name?$multi_instance_name} -> postfix
postmap: dict_eval: const postfix
postmap: dict_eval: const postdrop
postmap: dict_eval: expand $myhostname, localhost, localhost.localdomain, localhost.$myhostname -> mail.warsawinternational.net, localhost, localhost.localdomain, localhost.mail.warsawinternational.net
postmap: dict_eval: const mail.xxx.net
postmap: dict_eval: const
postmap: dict_eval: const /usr/libexec/postfix
postmap: dict_eval: const /var/lib/postfix
postmap: dict_eval: const /usr/sbin
postmap: dict_eval: const /var/spool/postfix
postmap: dict_eval: const pid
postmap: dict_eval: const all
postmap: dict_eval: const
postmap: dict_eval: const double-bounce
postmap: dict_eval: const nobody
postmap: dict_eval: const hash:/etc/postfix/aliases
postmap: dict_eval: const 20100319
postmap: dict_eval: const 2.6.6
postmap: dict_eval: const hash
postmap: dict_eval: const deferred, defer
postmap: dict_eval: const +
postmap: dict_eval: expand $mydestination, proxy:mysql:/etc/postfix/mysql/relay_domains.cf -> mail.xxx.net, localhost, localhost.localdomain, localhost.mail.xxx.net, proxy:mysql:/etc/postfix/mysql/relay_domains.cf
postmap: dict_eval: expand $relay_domains -> mail.xxx.net, localhost, localhost.localdomain, localhost.mail.xxx.net, proxy:mysql:/etc/postfix/mysql/relay_domains.cf
postmap: dict_eval: const TZ MAIL_CONFIG LANG
postmap: dict_eval: const MAIL_CONFIG MAIL_DEBUG MAIL_LOGTAG TZ XAUTHORITY DISPLAY LANG=C
postmap: dict_eval: const subnet
postmap: dict_eval: const
postmap: dict_eval: const +=
postmap: dict_eval: const -=+
postmap: dict_eval: const debug_peer_list,fast_flush_domains,mynetworks,permit_mx_backup_networks,qmqpd_authorized_clients,relay_domains,smtpd_access_maps
postmap: dict_eval: const
postmap: dict_eval: const bounce
postmap: dict_eval: const cleanup
postmap: dict_eval: const defer
postmap: dict_eval: const pickup
postmap: dict_eval: const qmgr
postmap: dict_eval: const rewrite
postmap: dict_eval: const showq
postmap: dict_eval: const error
postmap: dict_eval: const flush
postmap: dict_eval: const verify
postmap: dict_eval: const trace
postmap: dict_eval: const proxymap
postmap: dict_eval: const proxywrite
postmap: dict_eval: const
postmap: dict_eval: const
postmap: dict_eval: const 15728640
postmap: dict_eval: const 2
postmap: dict_eval: const 100s
postmap: dict_eval: const 100s
postmap: dict_eval: const 100s
postmap: dict_eval: const 100s
postmap: dict_eval: const 3600s
postmap: dict_eval: const 3600s
postmap: dict_eval: const 5s
postmap: dict_eval: const 5s
postmap: dict_eval: const 1000s
postmap: dict_eval: const 1000s
postmap: dict_eval: const 10s
postmap: dict_eval: const 10s
postmap: dict_eval: const 1s
postmap: dict_eval: const 1s
postmap: dict_eval: const 1s
postmap: dict_eval: const 1s
postmap: dict_eval: const 500s
postmap: dict_eval: const 500s
postmap: dict_eval: const 18000s
postmap: dict_eval: const 18000s
postmap: dict_eval: const 1s
postmap: dict_eval: const 1s
postmap: dict_eval: const 127.0.0.0/8
postmap: inet_addr_local: configured 3 IPv4 addresses
postmap: cfg_get_str: ./sender_login_maps.cf: user = vmail
postmap: cfg_get_str: ./sender_login_maps.cf: password = xxx
postmap: cfg_get_str: ./sender_login_maps.cf: dbname = vmail
postmap: cfg_get_str: ./sender_login_maps.cf: result_format = %s
postmap: cfg_get_int: ./sender_login_maps.cf: expansion_limit = 0
postmap: cfg_get_str: ./sender_login_maps.cf: query = SELECT mailbox.username FROM mailbox,domain WHERE mailbox.username='%s' AND mailbox.domain='%d' AND mailbox.domain=domain.domain AND mailbox.enablesmtp=1 AND mailbox.active=1 AND domain.backupmx=0 AND domain.active=1
postmap: cfg_get_str: ./sender_login_maps.cf: domain =
postmap: cfg_get_str: ./sender_login_maps.cf: hosts = 127.0.0.1
postmap: dict_open: mysql:./sender_login_maps.cf
postmap: dict_mysql_get_active: attempting to connect to host 127.0.0.1
postmap: dict_mysql: successful connection to host 127.0.0.1
postmap: dict_mysql: successful query from host 127.0.0.1
postmap: dict_mysql_lookup: retrieved 0 rows
if i send any mail to maniji@xxx.net, i get error msg "user unknown in virtual mailbox table"
and also i can't get any mail