iCloud Email is a develop by Apple Company, mostly users always used icloud email for personal or business purpose. Sometime many users forget password or users are not able to login or sign in icloud email on iphone or android, outlook, mac etc. and sometimes users are unable to send or receive email I am giving some steps to resolve this issue. If you forget password of icloud email then need to enter recovery email or recovery phone number for reset icloud password and enter new password then login it will be work properly. In case not happen then you can contact with icloud email contact support number. If you are not able to send or receive email then first check icloud email smtp server setting. If server setting is ok and your problems still not resolved then contact with apple icloud email customer service number.