postfix-ldap 2.7.1-1ubuntu0.2 (i386 binary) in ubuntu maverick

 Postfix is Wietse Venema's mail transport agent that started life as an
  alternative to the widely-used Sendmail program. Postfix attempts to
  be fast, easy to administer, and secure, while at the same time being
  sendmail compatible enough to not upset existing users. Thus, the outside
  has a sendmail-ish flavor, but the inside is completely different.
 This provides support for LDAP maps in Postfix. If you plan to use LDAP maps
 with Postfix, you need this.