diff --git a/docs/hardening/postfix-ldap/append_to_main.cf b/docs/hardening/postfix-ldap/append_to_main.cf
new file mode 100644
index 0000000000000000000000000000000000000000..9ec2ac1366e5316384931171676fc9d3d4a78356
--- /dev/null
+++ b/docs/hardening/postfix-ldap/append_to_main.cf
@@ -0,0 +1 @@
+relay_recipient_maps = hash:/etc/postfix/relay_recipients, ldap:/etc/postfix/ldap-aliases.cf
\ No newline at end of file