Postfix + távoli mysql

Sziasztok, ez lapján csináltam egy mailszervert, mysql adatbázissal a localhoston:

http://www.howtoforge.com/virtual_users_and_domains_with_postfix_debian…

Szeretném áttenni az sql -t egy másik hálóban lévő szerverre. A mysql adatbázissal való kapcsolatos fájlokat átírva ezt a hibaüzenetet kapom:

INSERT INTO logs (host, facility, priority, level, tag, date, time, program, msg) VALUES ( 'mail.xen.hu', 'mail', 'warning', 'warning', '14', '2009-03-07', '03:21:54', 'postfix/cleanup', 'postfix/cleanup[2541]: warning: CB155425A: virtual_alias_maps map lookup problem for peti@xen.hu' );

mail:~# nano /etc/postfix/mysql_virtual_alias_maps.cf

user = mailadmin
password = ********
dbname = mail
table = alias
select_field = goto
where_field = address
hosts = 10.10.50.3

A mailszerver a 10.10.40.2/24es címen van, a kapcsolat az adatbázissal működik.

main.cf:

mail:~# cat /etc/postfix/main.cf

smtpd_banner = $myhostname ESMTP $mail_name (Debian/GNU)
biff = no
append_dot_mydomain = no
smtpd_tls_cert_file = /etc/postfix/smtpd.cert
smtpd_tls_key_file = /etc/postfix/smtpd.key
smtpd_use_tls = yes
smtpd_tls_session_cache_database = btree:${queue_directory}/smtpd_scache
smtp_tls_session_cache_database = btree:${queue_directory}/smtp_scache
inet_protocols = ipv4
mydomain = xen.hu
myhostname = mail.xen.hu
alias_maps = hash:/etc/aliases
alias_database = hash:/etc/aliases
myorigin = /etc/mailname
mydestination = mail.xen.hu, localhost, localhost.localdomain
mynetworks = 127.0.0.0/8, 10.10.40.0/24
relayhost =
mailbox_size_limit = 0
message_size_limit = 10485760
bounce_size_limit = 50000
header_size_limit = 102400
queue_minfree = 0
recipient_delimiter = +
inet_interfaces = all
virtual_alias_maps = proxy:mysql:/etc/postfix/mysql_virtual_alias_maps.cf
virtual_mailbox_domains = proxy:mysql:/etc/postfix/mysql_virtual_domains_maps.cf
virtual_mailbox_maps = proxy:mysql:/etc/postfix/mysql_virtual_mailbox_maps.cf
virtual_mailbox_base = /home/vmail
virtual_mailbox_limit = 104857600
virtual_uid_maps = static:5000
virtual_gid_maps = static:5000
virtual_transport = virtual
smtpd_sasl_auth_enable = yes
broken_sasl_auth_clients = yes
smtpd_recipient_restrictions = permit_mynetworks, permit_sasl_authenticated, reject_unauth_destination
virtual_create_maildirsize = yes
virtual_mailbox_extended = yes
virtual_mailbox_limit_maps = proxy:mysql:/etc/postfix/mysql_virtual_mailbox_limit_maps.cf
virtual_mailbox_limit_override = yes
virtual_maildir_limit_message = "The user you are trying to reach is over quota."
virtual_overquota_bounce = yes
proxy_read_maps = $local_recipient_maps $mydestination $virtual_alias_maps $virtual_alias_domains $virtual_mailbox_maps $virtual_mailbox_domains $relay_recipient_maps $relay_domains $canonical_maps $sender_canonical_maps $recipient_canonical_maps $relocated_maps $transport_maps $mynetworks $virtual_mailbox_limit_maps

Googlen utánanéztem, de nem találtam megoldást.