Separation or division of mail according to post offices, transportation routes, counties, provinces, states or countries, or according to local delivery methods, e.g. general delivery, post office boxes, Letter Carrier routes, or postal station separations. (tri)

The distribution or separation of mail to route it to its final delivery point.

The distribution or separation of mail by ZIP codes, range of ZIP codes or carrier route.

Generic act of organizing items into a higher level kit or order. Can be manual or automated.