My iCloud email has stopped working on all my devices including the iCloud web interface. I can log in fine, and all other aspects of iCloud are working well.
I've tried signing in and out on both mac and iPhone, and changed my password to see if that would reset things, but none of it has fixed the problem. My gmail account is functioning just fine, so I don't think it is just an issue with the Mail app either.
Any ideas what could be causing it? I use iCloud for my main work email so I'm really keen to fix it asap.