The Postal Service™ is requiring all customers using Confirmation Services (such as Delivery Confirmation™ or Signature Confirmation™) and Electronic Verification System (eVS®) to use a mailer identification (MID) number that begins with the number 9 when the MID contains nine digits.
Letters were sent between April and June 2010 to all Confirmation Services and eVS customers that communicated assignment of new conforming nine-digit MIDs. Customers have until January 31, 2011, to convert to the newly assigned MID.
The assignment of new MIDs will enable mailers to take advantage of recent and planned Mailer ID system upgrades that enable centralized, automated customer profile management including MID assignment. Future enhancements include the following: