Unable to access yahoo or google mail with opera ...

[Demurrage]

... with the below message. Any thoughts what's causing this?

The server tried redirecting to an invalid address. Please report this to the webmaster of the site.

You tried to access the address https://login.yahoo.com/config/mail?.intl=us, which is currently unavailable. Please make sure that the Web address (URL) is correctly spelled and punctuated, then try reloading the page.
Make sure your Internet connection is active and check whether other applications that rely on the same connection are working.