What should be done with undeliverable First Class Mail that has a forwarding address?

When First Class Mail is undeliverable and has a forwarding address, it should be forwarded to the new address. This is consistent with the U.S. Postal Service's handling of mail that meets criteria for forwarding. In such cases, the mail is processed according to the forwarding order on file, allowing it to reach the intended recipient at their new location. Forwarding is carried out to ensure that the mail does not get lost or returned unnecessarily, facilitating communication and service continuity for the recipient.

The other options either delay mail service unnecessarily or are not in line with postal regulations. Returning the mail immediately does not consider the forwarding instructions provided, while discarding the mail entirely disregards the rights of the recipient. Holding the mail for further instructions also creates unnecessary delays in mail delivery, which is not beneficial in a postal context where service efficiency is key.