You can request a Proof of Delivery for applicable mailpieces by using the USPS Tracking® Tool at USPS®. Select Proof of Delivery and follow the provided directions to receive a Proof of Delivery email either with or without a delivery address.
What happens if the recipient is not available to sign for certified mail? If the recipient is not available, USPS leaves a notice slip and gives them 15 days to collect the mail or arrange for redelivery.
The addressee has 15 calendar days to pick up your registered mail with confirmation of receipt (in the Post Office or Post Point mentioned on the failed delivery notice). If the addressee does not pick up your mail within 15 calendar days, it will be sent back to you.
Return Receipt service (PS Form 3811) is available for: Priority Mail Express® (Form 3811 only) Priority Mail®, First-Class Mail®, USPS Ground Advantage™-Commercial™, and Parcel Select (if purchased with Certified Mail, Collect on Delivery (COD), Insurance over $500, or Registered Mail®)