<prompt> Translate the following text to EnglishKuna njia nne za kuamua: 1 Ugawaji wa barua za nje kwa muda wa uzito, 2 Ugawaji wa barua za ndani kwa muda wa uzito, 3 Ugawaji wa barua za nje kwa muda wa uzito.  <response>: There are four critical inputs to this 1 the distribution of outbound mail by weight interval, 2 the distribution of inbound mail by weight interval, 3 U.S. 