LDAP mail routing/aliases with Postfix
Postfix + LDAP

It is very straight forward configuring LDAP support into Postfix. There are three steps:

1) compile LDAP support into Postfix
2) edit /etc/postfix/main.cf
3) add the relevent routing & alias data to your LDAP server.

If you'd like more details, take a look at the documentation shipped with Postfix: LDAP_README

Feedback & additional documentation would be more than welcome!
Eric Harrison