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Mailer ID Guidelines
Documents: Mailer ID Usage Guidelines - Mailer ID (MID) Assignment Guidelines for Letters, Flats, and Parcels. Find answers to frequently asked questions on MID usage. Mailer ID and the Intelligent Mail Barcode - Mailer ID (MID) format within the Intelligent Mail barcode. |
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If you need assistance, please contact the U. S. Postal Service
National Customer Support Center at 877-640-0724, option 2
or email the NCSC at onecodesolution@usps.gov