Postfix TLS-Improvements

postfix/defaults/main.yml

@@ -43,6 +43,9 @@ postfix_transport_maps: []
 #    protocol: smtp
 #    use_mx: true
 
+# Note: This requires at least buster-backports or newer.
+postfix_enable_mta_sts: false
+
 postfix_my_networks: []
 postfix_notify_classes: []
 postfix_satellite_only: false