postfix + ldap db

[cazzola_luis at yahoo.com.ar (Luis Alejandro Cazzola)]

I want that postfix check the users in the ldap db that a have running but 
the only way that i find is compiling a source of postfix, and if i do that 
i have no anymore updates of postfix, so i have to update manualy each time 
thats be needed,  in debian exists a package of postfix compiled with ldap 
support, and with updates support, but no in centos, in the redhat networks 
exists ? or if i buy redhat , i will have the same problem?
thanks
ill wait for responses

lucho