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Letterboxes are located at post office/mail office / important places for the convenience of the publicOffice letterboxes are cleared in the presence of the sorting PA/SAOutside letterboxes are cleared by the LB attendant/LB peons at the prescribed hours.(Vol.VI-Part III-Rule 148-149)Office letterboxes should be cleared as frequently as required .
At Mail offices, Letter posted in the letter boxes after prescribed hours will be despatched on payment of prescribed late fee.Sorting PA/SA should keep custody of the keys and changeable hour plates of letterboxes. With reference to the hour plates brought back by the LB attendant ,the Sorting PA/SA knows that the letterboxes are punctually cleared. (P&T Manual Vol VI- I-Rule 73)