Be Skeptical When You Read Your Email
Keep asking Why should I believe that? It is important to remember that you can't trust the "from" address on e-mail from outside the organization, as it is often faked by fraudsters and viruses. If you didn't expect a message, link, or attachment from someone, ask yourself why you should trust that it really came from the apparent sender, and that it's safe. When in doubt, it's a good idea to call and verify that they sent you the message.
Don't Trust Links Sent in Email Messages
A common fraud, called "phishing", sends messages that appear to be from a bank, shop or auction, giving a link to a fake website and asking you to follow that link and confirm your account details. The fraudsters then use your account details to buy stuff or transfer money out of the account. These fake sites can be hard to spot, so no reputable organization will send a message requesting your confidential information.