Homeowners, renters, landlords, and anyone sending time-sensitive documents should be aware of an important change implemented by the U.S. Postal Service (USPS) that could affect mail delivery timelines and deadlines in 2026. What Changed With USPS Postmarks? As of December 24, 2025, the USPS updated how postmarks are applied to mail placed in collection boxes. Previously, the postmark reflected the...