ACS is a post mailing service that allows mailers to receive change-of-address (COA) and other reasons for non-delivery electronically and reduce the number of manual (hardcopy) address notifications.

Every Door Direct Mail (EDDM) is an online tool that simplifies direct mail campaigns. Marketers can create mail pieces, select specific postal routes and pay for postage online. Mail piece size and weight limits are flexible and can accommodate promotional items such as samples, menus, coupons, postcards. The USPS will hand deliver to every business and residence on the specified route.

NCOALink is a secure dataset of approximately 160 million permanent change-of-address (COA) records consisting of names and addresses of individuals, families, and businesses who have filed a change-of-address with the Postal Service. Developed with secure data store technology to increase security of postal customer data and protect the privacy of this information, the NCOALink Product enables mailers to process mailing lists and update lists with new addresses prior to mailing. The NCOALink data is provided on a regular basis to companies that have been licensed by the Postal Service.