Sometimes the project is not completed until it's in the mail. In the hands of our professionals, direct mail marketing and advertising just became simpler. The Dimensional Group offers data processing services as well as mailing list maintenance, postal rate and regulation guidance, and complete preparation of all classes and international mailings. USPS certified mailing list processing and CASS certification presorts your mailing by Carrier Route or Walk Sequence to save you money, as well as guaranteeing that your addresses are deliverable. We also offer ink jet addressing, machine label affixing, polybagging and laser printing.