Standard mail requirements can be found under Standard Mail preparations.
Undeliverable-As-Addressed (UAA) mail is forwarded, returned to sender, or treated as dead mail as authorized for the particular mail class. A mailer endorsement is used to instruct the Postal Service regarding the mail piece's appropriate disposition upon determining that it is UAA. On First Class Mail service, the following endorsements may be used as an updating method to meet the move update standard.
If UAA, the mail piece is returned with the new address or reason for non-delivery; no charge.