| GPSF Services- | On-Line Mailing Services |
| Detailed Service | Internet Link |
| USPS Domestic Rate Calculator | http://postcalc.usps.gov/ |
| USPS Mail Tracking/Delivery Confirmation | http://www.usps.gov/cttgate/ |
| USPS Zip Code Lookup/Addresses | http://www.usps.gov/ncsc/ |
| FEDEX(Federal Express) Rate Calculator/Tracking | http://www.fedex.com/ |
| UPS Rate Calculator | http://www.ups.com/ |
| UPS Tracking | http://www.ups.com/tracking/tracking.html/ |
| DHL Mailing Services | http://www.dhl.com/ |
| DHL Tracking | http://www.dhl-usa.com/tracking |