DMM Advisory | 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.

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May 21, 2026

Domestic Post Office Service Resumption Notice – Effective May 20, 2026

Effective Wednesday, May 20, 2026, the Postal Service™ has resumed acceptance of mail destined to Diplomatic Post Office (DPO) ZIP Codes 09292, 09294, 09295, 09301, 09809 and 09870.

All mailing services have resumed, including Priority Mail Express^®, Priority Mail^®, USPS Ground Advantage^®, and First-Class Mail^®, as applicable.

Please visit our Service Alerts page for the most up to date information: https://about.usps.com/newsroom/service-alerts/.