Indian Post Office Act, 1898
40. Duty of master of ship, departing from any port in
India and not being a mail ship, to convey mail bags
The master of ship,
not being a mail ship, about to depart from any port in 5[India] to
any port within, or any port or place beyond, 5[India], shall
receive on board any mail bag tendered to him by any officer of the Post Office
for conveyance, granting a receipt therefor in such form as the Central
Government may, by rule, prescribe, and shall, without delay, deliver the same
at the port or place of destination.