How does USPS inform customers of mail that could not be forwarded due to a change of address?

The correct choice is provided through postal mail alerts. When a customer submits a change of address request and some of their mail cannot be forwarded to the new address—perhaps due to restrictions on certain types of mail or because the sender did not provide a forwarding address—the USPS takes the responsibility of notifying the customer. They send postal mail alerts specifically to inform the individual about this situation. This method ensures that the information is delivered in a tangible form that customers can easily reference, keeping them aware of any mail delivery issues related to their change of address.

The other options are less applicable in this context. Email notifications are not typically used for this purpose, as physical mail is the method that aligns with the traditional communication practices of the USPS. Similarly, while some agencies may use SMS for certain updates, the USPS primarily focuses on using postal mail for official notifications regarding mail forwarding issues. Lastly, stating that they do not inform customers neglects the important role of keeping customers updated on their mail deliveries, which is inherent in the USPS’s commitment to customer service.