I have setup a Kopano server like described in the Administration Manual. We are using Active Directory for user management and Postfix for mail delivery.
The Postfix configuration looks like:
virtual_mailbox_domains = example.com
virtual_mailbox_maps = ldap:/etc/postfix/ldap-users.cf
virtual_alias_maps = ldap:/etc/postfix/ldap-aliases.cf, ldap:/etc/postfix/ldap-groups.cf, ldap:/etc/postfix/ldap-groups-expand.cf
virtual_transport = lmtp:127.0.0.1:2003
Now we have some users with the same domain(virtual_mailbox_domains) which are not maintained by Kopano but a other mail system on another place.
I want to to relay all mails to these users to a specific host. Does anybody know how to setup postfix for that purpose.