As it faces a worsening financial situation and frustration with Congress mounts for failing to enact cost-cutting reform measures, the U.S. Postal Service announced on Wednesday that it will seek to phase out six-day delivery service later this year.

However, of critical importance to online sellers, the agency said that it will continue to deliver packages on Saturdays, even as residential and business delivery of regular mail on that day would end in early August.

Saturday Package Pickup: To Be Determined
Under the new plan, the Postal Service would continue to deliver regular mail to P.O. boxes, and retail post offices that are currently open on Saturdays would remain open on that day. DeLancey said that it is unclear whether the Postal Service will offer package pickup on Saturdays, but that the agency’s operations team is still working through many of the details of the plan, which will be released in the coming weeks.

Read more: USPS Addresses Online Seller Concerns over Five-Day Delivery.