Where by rules of court the registrar is authorised to make payments of money
to persons entitled thereto upon their request by transmitting to them by post
crossed cheques or other documents intended to enable them to obtain payment
of the sums expressed therein, the posting of a letter containing the cheque
or document and addressed to the person entitled thereto at the address given
by him in his request shall, as respects the liability of the registrar and of
the Treasurer respectively, be equivalent to the delivery of the cheque or
document to that person himself.