Mailing Standards of the United States Postal Service Domestic Mail Manual > Forms Glossary [1-21-18] The Forms Glossary lists all of the forms and postage statements referenced in the DMM. These forms and many others are available on Postal Explorer at pe.usps.com (click on “Postage Statements” in the left frame). Postal Service forms may be preceded by “PS Form,” which simply stands for “Postal Service Form.” For example: “3541,” “Form 3541,” and “PS Form 3541” all refer to the Periodicals postage statement. | |