<prompt> Translate the following text to EnglishKwa kupanua uthibitisho wa utoaji kwa barua ya darasa la kwanza kama mbadala wa barua iliyothibitishwa, kuna uwezekano wa kuendesha zaidi ya dola milioni 300 kwa mwaka katika gharama za msaidizi wa dirisha na mtoa barua kutoka kwa mfumo.  <response>: By extending Delivery Confirmation to First-Class mail as a replacement for Certified Mail, the potential exists to drive in excess of 300 million per year in window clerk and letter carrier costs from the system. 