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Mailer ID (MID) is a field within the Intelligent Mail barcodes that is used to identify Mail Owners/Mailing Agents. It is required in all Intelligent Mail barcodes and is used by the Postal Service to identify mail owners/mailing agents. There is a complimentary website, http://www.mailersid.com/, to help mailers get their MID easily electronically for submission to the USPS.