The standards in describe how to mail using an MMS.
At the conclusion, the USPS reexamines the mailer’s system.
Keylines on First-Class Mail or USPS Marketing Mail may use only the price category abbreviations found in Publication 401, Chapter 6.
All pieces that qualify for more than one postage price must show each price category abbreviation, separated by a “/” (slash) (e.g., EB/DS).
For Priority Mail Express (Electronic Verification System “e VS” only) see .
Manifesting for International Mail is limited to Priority Mail International and First-Class Mail International.