Phishing Email has been one of the favorite attack of hackers, and it's that way because it's really easy to attack tons of users at the same time. And that kind of attack are about probability... i mean the 0.01% will hit the bait, so, if the attacker sends a mail to 10000 users at least 1 will get scammed, so, what happens if the attack goes to 1M users.  So, be careful with mail and never open a link from there.