Home > About USPS & News > Forms & Publications > Postal Periodicals and Publications > Publications > Publication 401 - Guide to Manifest Mailing System > 3 Quality Control
3-1.1 To participate in the Manifest Mailing System (MMS), you must implement a documented quality control (QC) program that ensures the following:
3-1.2 Your QC procedures and reporting documents must be approved by the Postal Service and described in an attachment to the authorization letter or agreement. Sample QC procedure attachments are shown in Exhibits 2A through 2F.