<prompt> Translate the following text to EnglishHii itawezesha makadirio ya kuaminika ya mapato ambayo Huduma ya Posta ingepokea kwa kutumia viwango vya posta vya ndani kwa barua kama hizo.  <response>: This would allow a plausible estimate of the revenue the Postal Service would receive by applying domestic postage rates to such mail. 