different users on different qmail-ldap

Mario Remy Almeida <[email protected]> Tue, 12 Jul 2011 11:18:16 +0400
Newsgroups gmane.mail.qmail.ldap
Organization ISA
Message-ID <[email protected]>
Hi All,

Users
[email protected], [email protected] on qmail-ldap server host1
[email protected] and [email protected] on qmail-ldap server host2

host1 server is the master server to send and receive all the email, 
host2 will route via host1

On host 1 how can I tell email for [email protected] and [email protected] to be delivered 
on server host2?

I know ldap attribute "mailHost" says something like that, But I am not 
sure. Is this the correct attribute to use?