I have had the same problem for the past couple of days... emails returned that I did not send. I can see about 10 or so, mostly originating from Vietnam, Thailand, Belarus, etc., all being sent to unknown by me people in the UK. I have deleted all devices and changed password twice, and right after my first password change another bogus email was sent. This is pretty ridiculous. Is Evernote doing anything about this? I hadn't even used Evernote for months!