FedEx has announced “that FedEx Ground has officially started delivering FedEx Home Delivery packages on Sunday for the majority of the U.S. population.”

The moves comes as FedEx strives to “better serve the fast-growing e-commerce market.” Over the holiday season, Amazon banned its third-party sellers form using FedEx Ground over concerns the service was too slow and that packages would not arrive in time for Christmas. The news should go a long way toward dispelling those concerns moving forward.

“Now that FedEx Ground delivers FedEx Home Delivery packages on Sundays to most U.S. residences, we have increased our speed advantage significantly to kick off the new year,” said Raj Subramaniam, president and chief operating officer of FedEx. Corp. “This provides added value to e-commerce shippers throughout the U.S. and the 188 million online shoppers in 7,700 cities and towns where FedEx Home Delivery packages are delivered on Sundays. As more customers expect weekend delivery, this enhancement to our network means that every day is now a delivery day at FedEx.”

The change is another example of the increasing importance of e-commerce to the U.S. economy and the changes companies are willing to make to keep pace with it.