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Can You Put Packages in USPS Drop Boxes in 2026 Official Postal Guidelines

"Under current official United States Postal Service guidelines, you can put packages in blue collection boxes only if they fit completely through the mail slot without forcing them and have prepaid postage. If your package requires retail counter service, contains hazardous materials, or is too bulky for the slot, you must take it to a Post Office or schedule a carrier pickup. Navigating postal regulations requires a clear understanding of what is permissible when utilizing standard United States Postal Service collection receptacles. As postal security measures and processing standards continue to evolve, adhering strictly to dimensional thr..."

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