How can I tell if an email is real or "phish"?

How can I tell if an email is real or "phish"?

Robert Siciliano: Often it is very difficult, if not impossible, for most consumers to determine if an email is real or if it's a phish. I will tell you right now that there isn't a legitimate corporation out there right now that will send you off an email asking you to update your account, asking you for your username and password to plug in right in that email. Additionally, you're not going to have any major corporations sending you links to their website to plug in usernames and passwords, because they know that phishing has essentially ruined email communications.