DMM Advisory | Postal Explorer

Postal Explorer

The Postal Service is reminding customers that metallic mercury and devices containing metallic mercury are always prohibited in the mail stream. This includes antique items such as thermometers, barometers, blood pressure monitors and similar devices.

Pricing & Classification DMM Advisory

Message board to keep postal customers informed of changes to mailing standards, services, and prices.

Return to Message board

March 21, 2025

Monthly Labeling List Changes

Effective April 1, 2025, the Postal Service™ will revise Labeling List(s) L003, L011, L012, L015, L051, and L801 to reflect changes in mail processing operations. Mailers are expected to label according to these revised lists for mailings inducted on or after the April 1, 2025, effective date through the May 31, 2025, expiration date.

Note: Due to the extensive number of changes to the following Labeling Lists, the changes will not be published in this Postal Bulletin. Additionally, as of April 1, 2025, these Labeling Lists will be deleted from the External Label Lists:

L003 3-Digit ZIP Code Prefix Groups — 3-Digit Scheme Sortation
L011 Non-NDC/ASF Entry — Periodicals and Standard Mail Letters
L801 AADCs — Letter-Size Mailings

To access these changes, as well as a complete listing of EELLs changes in Postal Pro (effective April 1, 2025), go to postalpro.usps.gov/operations/labeling-lists/changes-april-2025.

Current Labeling Lists can be found on the FAST website at https://fast.usps.com/fast/fastApp/resources/labelListFiles.action