The United States Postal Service (USPS) typically delivers mail on all days of the year, including weekends and holidays. That said, due to the COVID-19 pandemic, USPS is making some changes to their holiday shipping schedule this year. While they are still delivering mail and packages on December 26th, it's important to note that there may be delays and/or reduced services at certain locations around the country. Customers should check with their local post office for specific hours of operation and service availability information before heading out or sending any packages on December 26th. Additionally, if you're planning on having something delivered by Christmas Day (December 25th), make sure you plan ahead! USPS recommends allowing extra time when mailing items during peak periods like holidays so that your package arrives in time.