In any proceeding for the recovery of postage or other sums in respect of postal packets—
(1)the production of any postal packet in respect of which any such postage or sum is sought to be recovered, having thereupon a Post Office stamp denoting that the packet has been refused or rejected, or that the addressee was dead or could not be found, shall be prima" facie evidence of the fact denoted ; and
(2)the person from whom any postal packet in respect of which any such postage or sum is sought to be recovered purports to have come shall, until the contrary is proved, be deemed to be the sender of the packet.