Can You Send Certified Mail to a Post Office Box?


Certified mail service from the U.S. Postal Service provides the mailer with a dated receipt that includes a unique article number at the time of mailing. Certified mail is accountable at the point of delivery, which means the recipient must sign for the item.


  • You can send certified mail to a P.O. Box. When a recipient is not available to sign for a certified item, the Postal Service leaves a notification slip PS3849. This slip informs the customer that his certified mail will be available for pick up at his local Post Office for 15 days.


  • The Postal Service sends out a second notice to the addressee after five days. Unretrieved certified mail is returned to the sender after 15 days with the endorsement, unclaimed.


  • You cannot track certified mail online. Unlike delivery confirmation, certified mail can only be traced by the Postal Service.


  • For certified mail service, items must be sent by first class or priority mail. Certified mail service is not available for parcel post or media mail items.


  • As of January 2010, certified mail service can be added to any first class or priority mail item for $2.80.

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