Customers of email services provider Epsilon began informing millions of individuals in North America and Europe that their name and e-mail address had been stolen in a massive data breach. Email addresses can give criminals the information they need to perform some highly-targeted spear-phishing schemes. The criminals don t need to come to you and if they do, they will be very smart and targeted about it. The sheer volume of the Epsilon breach means that the amount of information that could be gathered just based on a massive phishing scheme could translate into substantial returns.
Source: https://threatpost.com/how-phishers-will-use-epsilon-data-against-you-041211/75127/