First off, the lock icon has moved on your browser (if you are using firefox or IE 7). Security info is now next to the address bar at the top of the screen and the lock is bigger now. You can also right click on the page to get security info by clicking on “View Page Info” in Firefox and “Properties” in IE 7.
Secondly, secure pages begin with https: instead of http:. If you are being asked to login, enter in your address or credit card info, make sure the page begins with https:.
Thirdly, I highly recommend opening up a browser and typing in an address instead of relying on a link in an email. Because they could be doing this:
If you are on a page asking you to login or give your payment info and you don’t see the padlock and the page begins with http: instead of https:, then it is best to move on.