Mailer Identifier (MID) Details
The Mailer Identifier (MID) is a field within the Intelligent Mail barcode that is used to identify mailers. MIDs are assigned by the USPS® to a Mail Owner, Mailing Agent or other service providers who request them.
MIDs are either a 9-digit or a 6-digit numeric code and are assigned based on annual mail volume criteria. One 9-digit MID is assigned to a business location without a volume requirement.
TrueNCOA Support
TrueNCOA supports the Mailer Identifier (MID) as part of the Processing Acknowledgement Form (PAF) process, or used to support mailings using the Intelligent Mail® Barcode (IMb).
The Intelligent Mail barcode is a 65-bar Postal Service™ barcode used to sort and track letters and flats. It allows mailers to use a single barcode to participate in multiple Postal Service programs simultaneously, expands mailers' ability to track individual mailpieces, and provides greater mail stream visibility.
The IMb is required for use on letters and flats prepared for automation prices. This requirement affects First-Class Mail postcards, Insured Mail, Certified Mail, and any other mail using extra services currently available and appropriate for the class and shape of mail prepared for automation prices.
Registered Mail is ineligible for automation prices because of the way it is handled during processing.
There are three options for using the IMb: non-automation, basic automation, and Full-Service. In each of these cases, you'll want to ensure that you've tested your barcodes for compatability and accuracy or work with certified vendors.