ifplugin Mail::SpamAssassin::Plugin::FreeMail
  header   __freemail_dispto  eval:check_freemail_header('Disposition-Notification-To')
  meta     FREEMAIL_DISPTO  ( __freemail_dispto && !__freemail_safe )
  describe FREEMAIL_DISPTO  Disposition-Notification-To/From or Disposition-Notification-To/body contain different freemails
  score    FREEMAIL_DISPTO  0.25
endif