FORT MYERS, Fla.- Patrick McMaster is one of the millions of victims in what authorities are calling the largest personal information heist in history. 

His bank, pharmacy, and even a department store contacted him to say his personal email address was stolen. A Texas marketing firm called Epsilon was hired to store the information, and send emails out to clients from companies like Best Buy and Chase. 

But hackers broke in, and now authorities say the emails are in the wrong hands. 

Experts say to be careful when receiving emails from any companies. It could be a hacker trying to get your personal information.