En garde, FedEx, UPS, and DHL … - DC Velocity The U.S. Postal Service is stepping up efforts to wrest a bigger share of the parcel delivery market from its private sector rivals. And this time around, it's trying a new tactic. In years past, the federal agency has typically challenged its competitors—FedEx, UPS, and DHL—on the basis of service (for example, by adding tracking and tracing capabilities for express and parcel shipments). Now, it's attacking on another front: pricing.