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People expecting packages before Christmas got a pleasant surprise Sunday from the United States Postal Service.

"Today is one of the first years we're running on Sunday. We're going to be out delivering to not impact our customers and we hope to catch people while they're actually home so we don't have to leave notices,” said Cheryl Love, Postmaster of the USPS Des Moines office.

Drivers delivered to make sure all customers receive their packages by Christmas Day.

The Des Moines distribution center handles about 150,000 packages on a typical day.  This week, that number is expected to double.

Wednesday will be the busiest day for mail delivery while Thursday will be the busiest for packages.

One driver tells Channel 13 News she was happy to work today to reduce her workload later in the week.

"We won’t have as many packages to deliver tomorrow morning. Mondays are usually pretty heavy with the day off Sunday. It will be a little bit easier tomorrow for us,” said Delivery Driver Jennifer Scully.

If you're planning on shipping anything across the country, the U.S. Postal Service recommends having it in the mail no later than Tuesday the 17th.