mailserver: add VERP marking of outgoing an unmarking of incoming mails

mail_system/templates/postfix/sender_canonical_maps.cf

@@ -0,0 +1,21 @@
+# THIS FILE IS CONTROLLED BY ANSIBLE - DO NOT CHANGE IN DEPLOYMENT!
+
+
+# man pgsql_table
+
+user = {{ mailserver.postgresql.username }}
+password = {{ mailserver.postgresql.password }}
+dbname = {{ mailserver.postgresql.dbname }}
+hosts = {{ mailserver.postgresql.host }}
+query = insert into mail_from (id, original, rewritten)
+  values (nextval('mail_from_id_seq'), '%s',
+    case
+    when regexp_replace('%s', '.*@([^@]+)$', '\1') in (select name from domains)
+    then case
+         when '%s'~*'{{ mailserver.postfix.verp_marker }}-\d+@'
+         then '%s'
+         else regexp_replace('%s', '^(.*)@[^@]+$', '\1') || case when '%s'~'\+' then '{{ mailserver.postfix.verp_marker }}-' else '+{{ mailserver.postfix.verp_marker }}-' end || lastval()::text || '@' || regexp_replace('%s', '.*@([^@]+)$', '\1')
+         end
+    else '%s'
+    end
+  ) on conflict (rewritten) do nothing returning rewritten