spam gateway checking for existing recipients

[Daniel Canas]

hello,

I have a machine that acts as a gateway and filters spam and virus  
for our domain.
I use smtproutes to forward the messages to an internal mail server  
that is not qmail.

I put the domians to forward in rcpthosts and it works fine. Now I  
want to filter out emails to non-existing users.

We have an internal open-LDAP server and I have added the qmail-ldap  
schema, now I want the gateway to use the RCPTCHECK functionality by  
checking the ldap db on the internal ldap server.
The problem is that per the INSTALL file, the RCPTCHECK only applies  
to domains listed in locals and recipient domains in ~control/ 
rcpthosts are allowed without checks.

Is it posible to do an ldap recipient check for an "external" domain  
(non-local account), or is there another way to solve the problem?