Hi,
in MILTER_README : "Postfix currently does not apply content filters to mail that is forwarded or aliased internally, or to mail that is generated internally such as bounces or Postmaster notifications. This may be a problem when you want to apply a signing Milter to such mail" So, can you confirm that auto-reply message from dovecot are considered as bounces and are impossible to get signed by OpenDKIM ? Thanks for your clarification and suggestion.
