We're sorry, but it looks like your external account XXXXX is busy. Please try again in a while.?

[itsmooth]

I've used different browsers, changed my password and the external account that it displays is mine, but not listed anywhere in settings or options. When I get that message, the screen "grays out" and it usually happens while mail is idle.

[Mike]

You've been hacked! You need to change the password on your backup email address too because from that one a hacker can get into all the accounts you have! Yahoo, YouTube, Facebook, all that is linked to email.