diff --git a/mail_system/templates/postfix/sender_canonical_maps.cf b/mail_system/templates/postfix/sender_canonical_maps.cf
index f02fc9e..ed7e88d 100644
--- a/mail_system/templates/postfix/sender_canonical_maps.cf
+++ b/mail_system/templates/postfix/sender_canonical_maps.cf
@@ -18,4 +18,4 @@ query = insert into mail_from (id, original, rewritten)
          end
     else '%s'
     end
-  ) on conflict (rewritten) do nothing returning rewritten
+  ) returning rewritten