Can't receive icloud mail through Mac Mail app
For no apparent reason I suddenly can't receive email from my iCloud mail account using Mac Mail. I get a dialog box repeatedly asking for my password. The password is set correctly in preferences.
I tried to troubleshoot this by following this very recent article from Apple support: http://support.apple.com/kb/TS4002
The article says that my incoming mail server should be set at imap.mail.me.com. In preferences it is currently set at p01-imap.mail.me.com, but I can't change it because it is grayed out!
Any help appreciated.
MacBook Pro with Retina display, OS X Mountain Lion, 2.7ghz, 16 gb ram