<prompt> Translate the following text to EnglishHii inaweza kufanywa kupitia punguzo la kushiriki kazi au mikataba na ni ufanisi hasa wakati wauzaji wa barua wanaweza kufanya kazi kwa njia tofauti na Huduma ya Posta.  <response>: This can be done through worksharing discounts or contracts and is especially effective when mailers can do the work in a different way than the Postal Service. 