Obtaining a Mailer ID from the USPS

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A mailer ID is a 9-digit number that is required when using Electronic Return Receipt (ERR). To get a mailer ID, you need to submit Form 5053, Bulk Proof of Delivery to the USPS.

To learn about how to obtain a Mailer ID from the USPS, visit the USPS Business Customer Gateway Mailer ID page. This page explains the the Mailer ID Service and how to apply for a Mailer ID.

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UPDATED: February 22, 2021