Usually the first tell tale sign is the email address. It may look like EA (or any other company for that matter) but upon closer inspection you will see something different, like the extra 'e' in the email address, or 'Amazonhelp@amazn.co.uk'
If you are ever unsure about your account, or if you're worried that something may have happened, always contact them through their official email address and never the one that sent you the original email. Same goes for telephone numbers. Some of the emails can be quite threatening so it can be a peace of mind to check via the official contacts to make sure everything is okay.
