Here's a basic example for using LDAP to look up
local(8)
aliases. Assume that in main.cf, you have:
alias_maps = hash:/etc/aliases,
ldap:/etc/postfix/ldap-aliases.cf
and in
ldap:/etc/postfix/ldap-aliases.cf you have:
server_host = ldap.my.com
search_base = dc=my, dc=com
Upon receiving mail for a local address "ldapuser" that isn't
found in the /etc/aliases database, Postfix will search the LDAP
server listening at port 389 on ldap.my.com. It will bind anonymously,
search for any directory entries whose mailacceptinggeneralid
attribute is "ldapuser", read the "maildrop" attributes of those
found, and build a list of their maildrops, which will be treated
as
RFC822 addresses to which the message will be delivered.
