postal service saturday delivery is an important feature for customers who need to receive or send mail on the weekend. The United States Postal Service (USPS) offers Saturday delivery for a variety of mail services, including First Class Mail, Priority Mail, and Priority Mail Express. Saturday delivery ensures that customers can receive their packages or letters on the weekend, providing a convenient option for time-sensitive shipments. USPS Priority Mail Express offers guaranteed overnight delivery, even on Saturdays, while other services like First Class and Priority Mail are typically delivered within 1-3 business days, including Saturdays. Saturday delivery is particularly useful for businesses that need to meet tight deadlines or for individuals who want to receive packages over the weekend. While USPS generally does not offer mail delivery on Sundays, exceptions are made for Priority Mail Express, which guarantees delivery on Sundays if the package is time-sensitive. For customers relying on weekend deliveries, it’s important to check with USPS to ensure that their mail or packages will arrive on the desired day.