What is the minimum number of mailpieces required for a mailer to use a 6-digit mailer ID?

The minimum number of mailpieces required for a mailer to use a 6-digit mailer ID is 10 million pieces. This requirement is based on the mailing standards set by the United States Postal Service (USPS) to encourage larger volume mailings, which helps to streamline processing and improve efficiency. The 6-digit mailer ID is designed for high-volume mailers who can ensure consistent and frequent mailing workflows.

Mailers with this ID can enjoy benefits such as customized tracking and delivery options, which are typically reserved for those who regularly send a significant volume of pieces. The tiered structure of mailpiece volume requirements helps the USPS allocate resources more effectively and offers certain privileges to those who contribute to the mailing ecosystem at a larger scale. Thus, only mailers meeting or exceeding the threshold of 10 million pieces are eligible for this identifier.