MAC™ Certification

MAC is a software certification process designed in cooperation with the mailing industry to evaluate USPS^® manifest mailing products manufactured by software developers. MAC determines whether the manifest mailing software accurately lists and calculates postage for identical and/or nonidentical-weight permit imprint mailpieces submitted according to the standards of the DMM^® and IMM^® reference manuals and Publication 401, Guide to the Manifest Mailing System. MAC certification is available only to software companies that develop manifest products for resale or internal use.

Use of MAC certified software greatly reduces the occurrence of manifest errors and increases the accuracy of postage payment. In doing so, the business mail acceptance process is streamlined and the efficiency of mail processing is improved. Although MAC certification evaluates and certifies USPS manifest mailing products, the program does not guarantee acceptance of customer mail prepared using MAC-certified software. MAC certification does provide national approval of manifest listings, postage statement facsimiles, and other USPS forms required for manifest mailings. Participation in this program is voluntary and each user is responsible for proper software installation, use, and quality control maintenance.

The MAC Certified Software Products Listing is available at http://ribbs.usps.gov/files/mac/csp/mac_products.pdf.

For more information regarding MAC certification, contact the MAC certification coordinator at 1-800-238-3150.