Not sure if you know however most popular email service providers (Hotmail, Yahoo, AOL,Microsoft, Gmail etc) are now using app specific passwords for log in. Is it possible that your email account is asking for an app specific password? App specific passwords are passwords use for one email app and cannot be used for another email app. You have to generate one app specific password for each app. Research on this subject on Google and also log into you email account on the web and you should be able to generate an app specific password in the security section of settings.
Axel F.