Two credit unions and a bank are suing Target for the data breach that took place over the holidays. Employees Credit Union, of Dallas; KC Police Credit Union, of Kansas City, Mo.; and American Bank of Commerce, of Wolfforth, Texas, have filed a class action lawsuit against the retailer Thursday. The breach, which was likely caused by a spam email at a heating and air conditioning partner, exposed 40 million credit and debit cards.

Yahoo! Mail has a new email attachment preview function that allows users to preview HTML5 emails. The online giant partnered with Florida-based technology company Accusoft, a company that provides document, content and imaging. Accusoft's "Prizm Content Connect" lets Yahoo! Mail users see Microsoft Office and PDF documents in a viewer window without having to leave their inbox or download a file.

Email services firm Campaigner created some new survey in which they compare U.S. presidents to email marketers. The research called President Clinton the most "charismatic communicator" with 21 percent of those surveyed saying he would be the best email marketing communicator. President Obama took second place, garnering 18 percent of the vote, and Franklin D. Roosevelt came in third with 13 percent.

Groupon sent out an email this weekend promoting a discount gift certificate and mistakenly referred to Alexander Hamilton as a former president. The email offers recipients $10 off all $40 local deals purchased through Groupon and uses Hamilton's portrait taken from the $10 bill. A founding father, Hamilton never actually served as president. He was secretary of the treasury.

Security staffers raised concerns about Target's vulnerabilities at the server level at least two months before hackers stole customer data, including millions of email addresses and credit card numbers, from its servers. According to reports, at least one analyst suggested doing a security review of its payment system, but the request was ignored. The suggested review came as Target was in the process of updating payment terminals, a job that could expose a company to threats.

Crowdfunding site Kickstarter has revealed that its database has been hacked and some customer data has been stolen. The company said that credit card data was not compromised but said that usernames, passwords, email addresses, mailing addresses, and phone numbers were compromised. The company sent out an email to members and contributors advising them to change their passwords.

United Cooperative Services is warning about a national email scam being sent out to its members. Customers have received fake invoice with messages that contain links to malware embedded in the messages. The scam emails claim to be from utility and include a fraudulent bill.

A new report has revealed that top-level EPA employees often used private email accounts to conduct government business. According to a new report released by Senate Republicans on the Senate Environment and Public Works Committee, the group which accused the agency's internal watchdog of messing up an investigation, EPA officials used personal email accounts even more than was understood. In September, the EPA was cleared of any wrongdoing. The court found that the rules surrounding personal emails were not clear enough.

The Federal Trade Commission has issued a warning around a series of spam emails that are in circulation. The emails carry subject lines such as "funeral notification" or "passing of your friend," and include details of a legitimate funeral home. The emails are spam and contain links to malware. The FTC warns consumers not to open the emails, and to delete them right away.

Indianapolis Power & Light is warning customers about a fake email going around claiming to be a bill. The threatening email warns recipients that if they don't pay their bill right away then their service will be shut off. The company said that they do not threaten service she-off via email and revealed that they do not require or a specific payment method, the way the email does.