<prompt> Translate the following text to EnglishKwa hivyo, kupotosha kunaweza kuingia katika uchambuzi wa barua ya nje ya Marekani ikiwa kuna tofauti kati ya usambazaji wa wakala na usambazaji halisi.  <response>: Thus, distortion could enter the analysis of U.S. outbound mail if there are differences between the proxy distribution and the actual distribution. 