UPS SurePost is delivered to your address by the USPS after UPS gets the package to your state.
UPS carries the package the majority of the miles until it reaches your state and local USPS sorting facility where the package is then handed off to the USPS for final delivery.
USPS is who will actually deliver the UPS Sure Post package to you and not UPS themselves.
UPS Sure Post does not deliver the package to your door on a UPS truck.
UPS Sure Post hands the package off to USPS who then delivers the package to your address.
If you get USPS mail delivery at your home then the USPS will deliver your UPS Sure Post package to your door but if not then the USPS will deliver the package to you at the post office.
A SurePost package from UPS is a package that is shipped through UPS and then handed off to the post office that is USPS for final delivery to your address.
UPS Sure Post is similar to FedEx Smart Post where they handle the package from picking the package up and then when the UPS Sure Post package gets into the state it's to be delivered in then UPS Sure Post hands the package off to the USPS where USPS then takes over and delivers it to your local post office or your home.
UPS Sure Post does not deliver the package to your door on a UPS truck.
UPS Sure Post is a cheaper option for shipping and then UPS hands the package off to USPS which means that the UPS Sure Post can take a few days longer to get the package to your address.
UPS Sure Post is not as slow as FedEx Smart Post though but it's still a bit slower.