<prompt> Translate the following text to EnglishJambo la mwisho lipo kwa sababu mifumo ya posta inahitaji kubuniwa kushughulikia aina mbalimbali za barua, zinazozalishwa na aina mbalimbali za wajumbe.  <response>: The latter factor exists because postal systems need to be designed to handle a wide range of mailpieces, generated by a wide range of mailers. 