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The images can be viewed via email notifications or accessed through an online dashboard at informeddelivery.usps.com.
The online feature already has more than 5 million users nationwide and has received high marks, according to the USPS.
Around 96 percent of users said they are satisfied with the new feature and 95 percent check their notifications almost every day.
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Although all U.S. post offices will be closed Monday in celebration of Labor Day, Priority Mail Express delivery will continue during the holiday. Normal services will resume on Tuesday, according to the USPS.
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