> what do I have to do to implement LDAP? I believe I installed > many packages > that included LDAP. here is what I have: > > openldap-2.0.27-8 > nss_ldap-202-5 > openldap-devel-2.0.27-8 > php-ldap-4.2.2-17.2 Setup your LDAP Database and then put something like this in your sendmail.mc define(`confLDAP_DEFAULT_SPEC',` -h localhost -b o=Company,c=au') LDAPROUTE_DOMAIN_FILE(`/etc/mail/LDAP-Routing') FEATURE(`ldap_routing',,,`bounce',`preserve') in /etc/mail/LDAP-Routing I have a list of domains that use LDAP Routing domain1.com.au xxyye.com zzzzz.net.uk and thats it! The best part is you can do ALL you authentication from the one centralised database. O'Reilly have a great book 'LDAP System Administration' by Gerald Carter that should get you up & running. You may want to have a look at http://sourceforge.net/projects/phpldapadmin/ it's a nice easy way to administer your LDAP Database. Regards John