How to update the Mailer ID on the DM300C, DM400C, and more

Products affected: DM300C™, DM400C™, DM450C™, DM475™
Note: If no Mailer ID is entered, you will be prompted for one the first time a service requires the Mailer ID.

To update the Mailer ID:
  1. Press Menu.
  2. Select Setup.
  3. Press Page Down twice.
  4. Select Mailer ID / DUNS Number.
Note: The USPS used to use a DUNS number instead of a Mailer ID.
  1. Enter the Mailer ID Number.
  2. Select Accept.

UPDATED: October 07, 2016