Who do both CFS and PARS return mail to when the addressee has moved without a forwarding address?

When a piece of mail is undeliverable because the addressee has moved without providing a forwarding address, both Centralized Forwarding System (CFS) and Postal Address Recognition System (PARS) return the mail to the sender. This practice ensures that the original sender is notified that the intended recipient is no longer at the specified address, enabling the sender to take appropriate actions, such as updating their records or attempting other means of contacting the recipient.

Returning the mail to the sender rather than to the local post office or any other entity assists in maintaining an accurate and efficient mail delivery process. It allows the sender to update their database and possibly resend the mail if a new address becomes available. This method emphasizes the importance of sender responsibility in the mailing process, ensuring accurate delivery to the intended recipient.