Phishing e-mails often look like legitimate correspondence that tries to create a false sense of urgency intended to provoke the recipient to take immediate action. For example, phishing e-mails frequently instruct recipients to "validate" or "update" account information or face cancellation and/or penalty. Be very cautious of any email asking you to update sensitive information particularly, if it has a generic greeting.
Always be suspicious of e-mails that do not greet you by name. While not impossible, it is more difficult and costly for phishers to associate an e-mail address with the e-mail owners name on a mass scale. Because of this, phishing e-mails most often are addressed generically like "Dear Customer."