The mail will continue to run on Saturday, if President Barack Obama signs into law a continuing resolution Congress approved Thursday.
The U.S. Postal Service, a cost-recovery operation, announced in February it planned to end Saturday delivery of first-class mail this summer, a move intended to save $2 billion a year. USPS lost about $16 billion in 2012. The new schedule would still have allowed for package deliveries on Saturdays.
But Congress, in its passage of a new spending bill Thursday, included with no changes existing language that has mandated that the USPS deliver mail six days per week.
Postal officials maintain that the six-day requirement technically should allow the service to exercise more control over what category of mail it continues to deliver on Saturdays.