Setting up a mailer ID on the SendPro C Lite, SendPro C, SendPro+, SendPro C Auto
Your mailer ID is a 9-digit number that you need when using Electronic Return Receipt (ERR).
Products affected: SendPro® C Lite, SendPro® C, SendPro®+, SendPro® C Auto (2H00, 8H00, 9H00)
Your mailer ID is a 9-digit number that you need when using Electronic Return Receipt (ERR).
To get a Mailer ID from USPS, visit the USPS Business Customer Gateway Mailer ID page. A Mailer ID is a unique number used to identify your business in USPS mailing systems. The page explains what a Mailer ID is, why it's needed, and how to apply. If you're new to this, it also guides you through setting up an account and submitting your request.
- Tap Settings.
- Scroll down to the Envelope Printer Settings section.
- Tap Postage Refill.
- Tap Mailer ID.
- Enter the 9-digit number using the keypad.
- Tap Apply.
UPDATED: August 29, 2025