Based on feedback from customers to proposed changes in mailing standards for letter-size booklets and folded self-mailers, the Postal Service will continue to collaborate with the mailing industry to test folded self-mailer designs. The new standards will include only recommendations for folded self-mailers, rather than requirements, as we further explore mailing options.

The new standards will detail required changes for booklets and recommended changes for folded self-mailers mailed at automation and machinable letter prices. The information will be posted on Postal Explorer.