In relatively secure areas I would expect mail deliveries to be done using bicycles- even large items can be carried by one man if he is prepared to get off and push.
Some hostile territory could be within the postman's route, if he knew the area well and kept his eyes open. Equipment would be very basic- probably only a handgun or survival rifle for defence, a minimal repair kit, water and emergency rations. On longer routes it would be expected that the communities who received the mail would provide food and shelter.
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