The federal government entered a shutdown at midnight on Oct. 1 when lawmakers failed to pass new funding bills. It’s unclear how long the stalemate will last, and lawmakers do not appear to be any closer to coming to an agreement that could reopen the government.

Postal services, including mail delivery, will continue during the government shutdown. Essential services during a shutdown include the U.S. Postal Service, Medicare and Social Security services and air traffic control.

In a Sept. 25 statement, the U.S. Postal Service confirmed that its operations will not be interrupted in a shutdown, and post offices will remain open for “business as usual.” “Because we are an independent entity that is generally funded through the sale of our products and services, and not by tax dollars, our services will not be impacted by a government shutdown,” the statement said.