Home > About USPS & News > Forms & Publications > Postal Periodicals and Publications > Publications > Publication 401 - Guide to Manifest Mailing System > 10 System Reviews > 10-4 Business Mailer Support Responsibilities
10-4.1 Quarterly MMS Accuracy Worksheet Review
10-4.2 System Reviews
Each MMS must be reviewed every 3 years according to the instructions outlined in chapter 8.