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Postfix Documentation
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Example: local(8) aliases

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.

Postfix Documentation
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