<prompt> Translate the following text to EnglishWatu na Bunge wanaweza kutilia shaka ulinzi huo wakati inapojulikana kuwa Huduma ya Posta hutoa barua zisizofaa zaidi kuliko barua nyingine.  <response>: The public and the Congress may question such protection when it becomes common knowledge that the Postal Service delivers more junk than other letter mail. 