I've already received  emails from Walgreens, Target, and others concerning this. In case you receive emails from any of your accounts, Do Not reply with your accounts numbers, personal info, etc. Most reputable companies will Not ask you for personal information in an email.

A massive security breach at online marketing firm Epsilon means the email accounts of millions of people may have been compromised, Reuters reports. The breach exposes names and e-mail addresses of customers from companies including Target, Walgreens, JPMorgan Chase and Citibank. The New York Times reports that while the number of people affected is still unknown, security experts say that based on the businesses involved the breach may be among the largest ever and could lead to a rise in phishing attacks.

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via Morning Tech Wrap - Epsilon, Texas Instruments, Android - Parmy Olson - Disruptors - Forbes.