Implement dkim

switched over to dkimpy-milter scince opendkim is more or less discontinued

postfix/defaults/main.yml

@@ -75,11 +75,18 @@ postfix_verify_spf_testmode: true
 postfix_enable_srs: false
 # Note: This requires at least buster-backports or newer.
 postfix_enable_mta_sts: false
+postfix_enable_dkim: false
 
 postfix_my_networks: []
 postfix_notify_classes: []
 postfix_satellite_only: false
 
+postfix_dkim_internal_hosts:
+  - "127.0.0.1"
+  - "::1"
+  - "localhost."
+  - "{{ ansible_fqdn }}"
+
 ## sane defaults for postfix satellites
 #
 # postfix_satellite_only: true