LDAP Authentication

See http://wiki.dovecot.org/AuthDatabase/LDAP for more details.

passdb {
  args = /etc/dovecot/dovecot-ldap.conf.ext
  driver = ldap
}
userdb {
  driver = prefetch
}
userdb {
  args = /etc/dovecot/dovecot-ldap.conf.ext
  driver = ldap
}

These enable LDAP``to be used as ``passdb and userdb. The userdb prefetch allows IMAP or POP3 logins to do only a single LDAP lookup by returning the userdb information already in the passdb lookup. http://wiki.dovecot.org/UserDatabase/Prefetch has more details on the prefetch userdb.