<prompt> Translate the following text to EnglishUainishaji wa niche ni uainishaji wa barua maalum - ikiwa ni pamoja na viwango vya chini, lakini gharama za haki au ada - ambazo zimetengenezwa na Huduma ya Posta kwa kushauriana moja kwa moja na wateja wake, ili kukidhi mahitaji na uwezo wa mtumaji au kikundi cha wauzaji.  <response>: Niche classifications are specialized mail classifications- including reduced, but cost-justified rates or fees-that have been developed by the Postal Service in direct consultation with its customers, to meet the needs and capabilities of a mailer or group of mailers. 