In my Postfix config, I have smtpd_sender_login_maps pointing to a file ldap-senders.cf that contains the following: root@mail:/# cat /etc/postfix/ldap-senders.cf bind = yes bind_dn = cn=Administrator,cn=users,dc=internal,dc=DOMAIN,dc=com bind_pw = SomeP@5sword query_filter = (|(mail=%s)(proxyAddresses=smtp:%s)(memberOf=cn=Domain Admins,cn=Users,dc=*)) result_attribute = mail, uid search_base = dc=internal,dc=DOMAIN,dc=com server_host = dc1.internal.DOMAIN.com start_tls = yes version = 3 This allows […]