Websites not accepting me.com address
Over the last couple of months, I have had repeated problems with different websites not accepting my me.com email address. It's happened on shopping websites, my university website and others. I get error messages saying that I need to input a "valid email address." I've tried switching to .icloud and even my old .mac, but none work.
What's going on here and how can I get around it? I've never had these kinds of problems until recently. HELP!
MacBook, Mac OS X (10.6.8), Imovie '11