<prompt> Translate the following text to SwahiliAs a practical matter, mailers are believed in many cases to be able to do this work for a fraction of the cost the postal service would face.  <response>: Kwa kweli, katika visa vingi, wajumbe wa posta huamini kwamba wanaweza kufanya kazi hiyo kwa kiasi kidogo cha gharama ambayo huduma ya posta ingehitaji. 