LDAP stands for Lightweight Directory Access Protocol. LDAP provides lightweight access to the X.500 directory and is defined in RFC1777 and RFC1778.

The software and documentation for LDAP are available as open source from the following site:

http://www.openldap.org/                 The OpenLDAP Project

The software is also available commercially from Netscape, Inc.

To enable use of ldap database maps (ldap (was ldapx)) in your configuration file, enabled this LDAPMAP compile-time macro in your Build m4 file:

APPENDDEF(`confMAPDEF', `-DLDAPMAP')

If you are running a precompiled sendmail binary, you can use the -d0.10 debugging command-line switch (-d0.10) to determine if LDAPMAP support is defined (if it appears in the list, it is defined).