It's a service where UPS delivers packages to the post office and then the mailman delivers to your house/mailbox
Hello Dale - UPS SurePost® is an economical way to combine the best features of UPS and the convenience of post office delivery. You get the reliability of UPS tracking with the added convenience of the post office being able to deliver to locations (such as your mailbox) where UPS is unable to leave packages. As the final mile provider, the post office can deliver to a post office box, mail box or other addresses available only to the post office (such as an APO / FPO / Military Addresses).
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