Epsilon Data Management LLC

Hackers obtained the names and email addresses of customers of dozens of businesses maintained by Epsilon Management LLC. "Epsilon said only 2% of its database had been invaded, but dozens of
major companies across a variety of industries responded by emailing
their customers to notify them of the breach. The companies include
Citigroup Inc., Capital One Financial Corp., JPMorgan Chase & Co.,
1-800-Flowers.com Inc., Best Buy Co. Inc., L.L. Bean Inc. and Target
Corp".

Experts state that the biggest danger from this particular breach is  “phishing”
attacks, where hackers send emails to company customers in an effort to
obtain financial and other personal data. If you receive an email from entities that you have done or are doing business with, the advice is to not open the email, instead contact the company by phone to see if they have sent out a communication email to you. Those affected will also want to immediately change their passwords. Be cautious and don't trust that the email is legitimate, particularly from the companies that were named and do not ever provide personal information back to these types of emails.