A is a third-party company authorized by the United States Postal Service (USPS) to manage mailing logistics, presort services, and postage payment on behalf of mail owners (publishers, banks, direct marketers, etc.).
Instead of each mailer negotiating rates or preparing dropships individually, an NSP aggregates mail from multiple clients, sorts it to qualify for USPS automation and presort discounts, and enters the mail into the postal system under a single permit or account. postal nsp