You have to be careful with all of your email accounts. For example, look at this classic that arrived in one UD employee’s Yahoo! email account:
Most companies, banks, organizations, and universities do not send out email that asks you to click a link to validate your account. The safe thing to do is to log in at the Web address (URL) you usually use for your account and check your account status there.
This phish uses a stolen Yahoo! image and a forged Yahoo! copyright notice to try to trick you: It’s designed to scare you into reacting without thinking–to react to an alleged problem with your account by clicking the bogus link.
Just delete it.