2026 USPS Postmark Update: What Maryland Residents Should Know

WASHINGTON — The U.S. Postal Service (USPS) is clarifying that postmark dates on mailpieces may not always reflect the day an item was dropped in a mailbox or collection bin. Instead, with new transportation adjustments, postmarks are often applied when mail is processed at a postal facility — which may occur a day or more later.

This clarification took effect on Wednesday, Dec. 24, 2025, exactly 30 days after its publication in the Federal Register on Monday, Nov. 24, 2025, in accordance with standard federal rulemaking procedures. The update adds Section 608.11, Postmarks and Postal Possession, to the Domestic Mail Manual.

USPS says this update is intended to explain existing practices — not introduce changes.

“The Postal Service is adding section 608.11, ‘Postmarks and Postal Possession,’ to the Domestic Mail Manual (DMM). This new section defines postmarks, identifies the types of Postal Service markings that qualify as postmarks, and describes the circumstances under which those markings are applied,” the Federal Register states. “It also advises customers of how to obtain evidence of the date on which the Postal Service accepts possession of their mailings. This new language in the DMM does not change any existing postal operations or postmarking practices, but is instead intended to improve public understanding of postmarks and their relationship to the date of mailing.”

Why USPS Made The Change

The Postal Service chose to use the notice-and-comment rulemaking process to publish this clarification, even though it does not represent a rule change in the traditional sense.

“Nothing in DMM Section 608.11 effectuates any changes in how, or the extent to which, the Postal Service applies postmarks to mailpieces,” the agency wrote. “However, the postmark was not previously defined in any current Postal Service regulations, and the Postal Service considered it appropriate to reflect these existing practices in the DMM to ensure that customers have a clear understanding of the postmark and what it means.”

When Postmark Dates Might Differ

USPS says most postmarks are applied by automated machines at central processing facilities — not at local post offices. Since mail may not reach those facilities the same day it’s dropped off, the postmark may reflect a later date.

“While we are not changing our postmarking practices, we have made adjustments to our transportation operations that will result in some mailpieces not arriving at our originating processing facilities on the same day that they are mailed,” the Postal Service stated. “This means that the date on the postmarks applied at our processing facilities will not necessarily match the date on which the customer’s mailpiece was collected by a letter carrier or dropped off at a retail location.”

The postmark confirms the date USPS had physical custody of the item at a processing stage, not necessarily the day it was placed in a mailbox.

This can affect customers who rely on postmarks for proof of mailing by a deadline.

To make sure your mail is postmarked the same day it’s sent, USPS recommends:

• Customers can go inside a post office and request a manual (local) postmark at the retail counter. There is no cost for this service.
• Use Certified Mail or Registered Mail for proof of mailing and tracking.
• Purchase a Certificate of Mailing, which shows the exact date the item was accepted.
• Submit documents online when available — such as e-filing taxes or benefits — to avoid any mailing uncertainty.

Public Comments And More Information

The final rule published in the Federal Register also includes a detailed summary of public comments and USPS responses. Readers interested in the concerns raised by citizens and how the Postal Service addressed them can review Section III: Response to Comments in the official Postmarks and Postal Possession rule on the Federal Register website.

Wrapping Up: What To Do If You’re Worried

If you’re mailing something with a deadline and are concerned about when it will be postmarked, the Postal Service’s advice is simple: go inside your local post office and ask for a manual postmark at the counter. It’s free, and it gives you the peace of mind that your item is clearly marked with the date you mailed it. For important or time-sensitive documents, consider using Certified Mail, Registered Mail, or requesting a Certificate of Mailing to ensure you have proof and tracking if needed.

For more details, the Postal Service has also published a follow-up statement titled “Postmarking Myths and Facts” on Jan. 2, 2026, addressing common misconceptions and questions about how postmarks are applied.

Learn more at: Postmarking Myths and Facts

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