<prompt> Translate the following text to SwahiliBeginning in the early 1980s and continuing to the present, about 5 billion has been invested to automated mail processing, including the in-office carrier sequence function and forwarding for undeliverable-as-addressed mail.  <response>: Kuanzia mwanzoni mwa miaka ya 1980 hadi sasa, karibu dola bilioni 5 zimewekezwa katika usindikaji wa barua za moja kwa moja, ikiwa ni pamoja na kazi ya mfululizo wa waendeshaji wa ofisi na kuhamisha barua zisizoweza kutolewa kama zilizoelekezwa. 