About 50 clients hit by Epsilon e-mail marketing breach

The incident affected about 2 percent of Epsilon's 2,500 clients

About 50 companies were affected by a major security breach at e-mail service provider Epsilon Interactive that caused many U.S. corporations to warn their customers of online attacks Monday.

Epsilon first warned of the incident Friday, saying that someone had got into company systems and obtained e-mail addresses and names belonging to some of its customers. But it wasn't immediately clear how many of its 2,500 clients were at risk. Epsilon is still being tight-lipped about the problem, but it has now given a clearer picture of how many companies are affected.

In a brief statement posted to Epsilon's website Monday, the company said that "approximately 2 percent of total clients" -- about 50 businesses -- were hit.

Customers of many of these businesses, which include Target, Citigroup, Tivo and Walgreens, woke up Monday to e-mail warnings, telling them that their e-mail addresses had been stolen, and that spam or malicious messages could be coming their way. But so far, Epsilon has refused to provide a detailed list of all companies that were affected.

Companies hire Epsilon to send out a total of more than 40 billion messages on their behalf each year.

With millions of addresses thought to have been stolen, the problem may be worse than many people realize, security experts said Monday.

That's because once scammers know their victims' names and e-mail addresses, along with the companies that they do business with, they can craft very targeted "spear-phishing" e-mail attacks that try to trick victims into revealing more sensitive information such as passwords or account numbers.

"Everybody is downplaying it by saying, 'at least they didn't get financial information.' Well that's true, but what they did get was enough to potentially get financial information [in a phishing attack]," said Neil Schwartzman, executive director with the Coalition Against Unsolicited Commercial Email, a consumer advocacy group based in Montreal.

The IDG News Service has confirmed that the following companies have warned customers about the breach. Because Epsilon is often engaged by business units within these firms, not everyone who does business with these companies has had their e-mail address stolen. If you have received a notification from a company that is not included on this list, please contact robert_mcmillan@idg.com.


Ameriprise Financial

Barclays Bank

Best Buy



Disney Destinations

Hilton Worldwide

JP Morgan Chase



Marriott International

McKinsey Quarterly

New York & Company

Robert Half



US Bank


Robert McMillan covers computer security and general technology breaking news for The IDG News Service. Follow Robert on Twitter at @bobmcmillan. Robert's e-mail address is robert_mcmillan@idg.com

Join the Good Gear Guide newsletter!

Error: Please check your email address.

Tags marketingsecurityindustry verticalsinternetEpsilon Interactive

Our Back to Business guide highlights the best products for you to boost your productivity at home, on the road, at the office, or in the classroom.

Keep up with the latest tech news, reviews and previews by subscribing to the Good Gear Guide newsletter.

Robert McMillan

IDG News Service
Show Comments

Most Popular Reviews

Deals on Good Gear Guide

Deals on Good Gear Guide


Latest News Articles


GGG Evaluation Team

Kathy Cassidy


First impression on unpacking the Q702 test unit was the solid feel and clean, minimalist styling.

Anthony Grifoni


For work use, Microsoft Word and Excel programs pre-installed on the device are adequate for preparing short documents.

Steph Mundell


The Fujitsu LifeBook UH574 allowed for great mobility without being obnoxiously heavy or clunky. Its twelve hours of battery life did not disappoint.

Andrew Mitsi


The screen was particularly good. It is bright and visible from most angles, however heat is an issue, particularly around the Windows button on the front, and on the back where the battery housing is located.

Simon Harriott


My first impression after unboxing the Q702 is that it is a nice looking unit. Styling is somewhat minimalist but very effective. The tablet part, once detached, has a nice weight, and no buttons or switches are located in awkward or intrusive positions.


Latest Jobs


Don’t have an account? Sign up here

Don't have an account? Sign up now

Forgot password?