IRS expanded the
list of Private delivery services (if you don't
opt for the U.S.P.S.) you can use to satisfy its
"timely mailing as timely filing/paying" rule.
They are:
Airborn
Express -Overnight Air Express
Service, Next Afternoon Service and Second
Day Service.
DHL
Worldwide Express (DHL) - DHL Same
Day Service and DHL USA Overnight.
Federal
Express (FEDEX) - FedEx Priority
Overnight, Fed Ex Standard Overnight, and
FedEx 2nd Day
United
Parcel Service (UPS) - UPS Next Day
Air, UPS Next Day AirSaver, UPS 2nd Day Air,
UPS 2nd Day Air A.M., UPS Worldwide Express
Plus and UPS Worldwide Express.