Adult Signature
A Competitive Ancillary Service that requires the recipient of the mailpiece to be 21 years of age or older. The service has two options: (a) Adult Signature Required, in which anyone 21 years of age or older at the delivery address may sign for the mailpiece; and (b) Adult Signature Restricted Delivery, which requires the signature of the addressee or an authorized agent of the addressee, either of which is 21 years of age or older.