DGM uses USPS SmartMail technology to delivery packages at a cheap rate for small and medium sized business.
USPS DGM from what I remember stands for Domestic Ground Mail or at least that is what a postal employee told me.
SmartMail is a technology-driven service that works with the United States Postal Service (USPS) to collect, process, sort, track, and expedite the delivery of lightweight parcels and flat-sized mail. SmartMail offers a range of services, including:
Address and ZIP code verification: Prevents undeliverable or delayed mail.
Variable weight manifesting: Helps avoid overpayment of postage.
Proof of processing: Provides proof of processing for each mail piece.
With DGM smartmail the shipper will often have a shipping partner such as DHL to pick up the package and transport it along with other packages for a distance and then hand it off to the USPS for further shipping.
DHL SmartMail Parcel and Parcel Plus is a full service residential shipping solution which offers labeling, pickup, sorting and injection into the USPS postal stream.
DHL SmartMail Parcel Plus also offers the same features as does DHL SmartMail Parcel and includes flexible pickup times and tracking numbers.