I don't see a way to set this up either as automatic (drop them back in the queue after 1 week, for instance) or how to accomplish in a bulk operation as the out of office status doesn't appear in the status filter.. but it would be nice to have a way to re-queue out of office replies - when the "Stop sending on reply" open is enabled, either without manual intervention, or in bulk so that we don't have to go to each individual contact and change the status back to 'lead'