New standards for letter-size booklets and folded self-mailers will include recommendations only for folded self-mailers, rather than requirements. The Postal Service will continue to work with the mailing industry to test folded self-mailer designs and further explore mailing options before finalizing these standards.

The standards will detail required changes for booklets mailed at automation and machinable letter prices.

We'll keep you posted on when the requirements for letter-size booklets and recommendations for folded self-mailers will be posted on Postal Explorer at pe.usps.com