dn: uid=auser,ou=People,dc=example,dc=com
cn: A User
displayname: A User
gecos: A User
gidnumber: 1011
givenname: A
homedirectory: /home/auser
host: host1
host: host2
host: host3
host: host4
mailacceptinggeneralid: root
loginshell: /bin/bash
mail: a.user@example.com
objectclass: inetOrgPerson
objectclass: posixAccount
objectclass: shadowAccount
objectclass: hostObject
objectclass: postfixUser
objectclass: top
sn: User
uid: auser
uidnumber: 1001

server_host = ldap.example.com
search_base = dc=example, dc=com

# look for entries with this
query_filter = (|(uid=%s)(mailacceptinggeneralid=%s)(mail=%s@example.com))

# what attribute from the search result is returned
result_attribute = mail

# the format in which the result is returned
result_format = %s

# A query using the uid of the user
postmap -q auser ldap:/etc/postfix/ldap-mail.cf
a.user@example.com

# A query using the corporate username
postmap -q a.user ldap:/etc/postfix/ldap-mail.cf
a.user@example.com

# A query for a user specified in mailacceptinggeneralid
postmap -q root ldap:/etc/postfix/ldap-mail.cf
a.user@example.com

server_host = ldap.example.com
search_base = dc=example, dc=com
query_filter = (|(host=%3)(host=*))
result_attribute = mail
result_format = %s

postmap -q users@host2.example.com ldap:/etc/postfix/ldap-host-users.cf
a.user@example.com

# The following also returns a list of email addresses, but shouldn't:
postmap -q any_group@host2.example.com ldap:/etc/postfix/ldap-host-users.cf
a.user@example.com