Here is the release from the U.S. Postal Service website:
"There will be no regular mail delivery or retail services at Post Offices on Tuesday, Jan. 2, 2007, as the Postal Service is closing to observe the national day of mourning for President Gerald R. Ford. The decision follows an Executive Order issued by President Bush that independent federal agencies close as a mark of respect for the former president who died Dec. 26. Express Mail deliveries will be made on Jan. 2. Regular retail and delivery service will resume Wednesday, Jan. 3."