Fact Sheets
11/10/2026
Mailer Identifier (MID) Exception Process

The Postal Service will issue a Mailer Identifier (MID) to a mailer for use in the Intelligent Mail® container barcode, Intelligent Mail® tray barcode, Intelligent Mail® barcode or Intelligent Mail® package barcode. The MID is a field within the Intelligent Mail barcodes and is used to identify the mailer.

Fact Sheets
11/04/2026
Fact Sheets
10/22/2026
Intelligent Mail® for Small Business (IMsb) Fact Sheet

This fact sheet contains an overview of the IMsb Tool, its benefits, and how it works.