As a person whose address was marked as undeliverable for a period of time, I can confirm that the USPS doesn't text you or contact you in any way if they can't

As a person whose address was marked as undeliverable for a period of time, I can confirm that the USPS doesn't text you or contact you in any way if they can't deliver. Your mail just gets returned to sender (sometimes) and hopefully it's not time-critical.