Postfix + LDAP + Transport Maps

Hi Guys,

I have Postfix and LDAP working like a charm. However we have a
customer requirement to route messages based on the mailHost attribute
in each user. This works. However when sending mail out of the
environment, destined to an external address. Mail loops... I've
tried using relayhost, static transport has files as well as the LDAP
entry. Can someone point out what I'm sure is a blatent mistake :)

transport_maps = ldap:ldaprelayhost, hash:/etc/postfix/transport
ldaprelayhost_server_host = ldap.xxx.xxx.edu.au
ldaprelayhost_server_port = 389
ldaprelayhost_bind_dn = cn=root, dc=xxxx, dc=edu, dc=au
ldaprelayhost_bind_pw = xxxxxxx
ldaprelayhost_bind = yes
ldaprelayhost_timeout = 5
ldaprelayhost_search_base = dc=xxxx,dc=edu,dc=au
ldaprelayhost_query_filter =
(&(|(mail=%s)(mailAlternateAddress=%s)(mailLifeLon gAddress=%s)(mailDefaultAddress=%s))(|(AccountStat us=active)(|(objectclass=posixAccount))))
ldaprelayhost_result_attribute = mailHost
ldaprelayhost_lookup_wildcards = no

Relay host is empty as this stange, and /etc/postfix/transport contains:

* smtp:xxx.xxx.xxx.xxx <--- where xxx is a valid IP :)

I can post more contents of my contents if that would help..

Each LDAP user has an attribute such as:

mailHost smtp:10.10.10.10

Cheers,

James