<prompt> Translate the following text to SwahiliAs stated earlier, the profits from delivered and non-delivered mail must equal the upstream fixed cost in a breakeven post.  <response>: Kama ilivyoelezwa hapo awali, faida kutoka barua iliyotolewa na isiyowasilishwa lazima iwe sawa na gharama ya juu ya mtiririko katika chapisho la kuvunja. 