This just came across the wires, all right, the internet:
"U.S. Postal Service Resumes Accepting Mail to Canada
The U.S. Postal Service will resume accepting mail for Canada starting Tuesday, June 28, as a result of legislation passed yesterday by the Canadian government requiring Canada Post employees to return to work tonight."
For more go to http://www.usps.com/communications/newsroom/2011/pr11_077.htm