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A single malicious email sent to workers at the South Carolina Department of Revenue last August enabled an international hacker to gain access to 3.8 million tax returns.

President Obama stands by Gen. John Allen in spite of thousands of possibly inappropriate email exchanges , according to White House Press Secretary Jay Carney.

Emails sent to Jill Kelley triggered the FBI investigation of CIA Director David Petraeus. Members of Congress want more details about the probe... Members of Congress said Sunday they want to know more details about the FBI investigation that revealed an extramarital affair between ex-CIA Director David Petraeus and his biographer, questioning when the retired general popped up in the FBI inquiry, whether national security was compromised and why they weren't told sooner.

A Washington state man was arrested by federal agents on Tuesday after making threats against President Barack Obama in emails sent to the FBI, authorities said.

Opponents of Arizona’s hardline immigration enforcement law contend that emails sent, received and forwarded by a former legislator who championed the law support allegations it was racially motivated.

Yahoo says it has fixed the vulnerability that allowed 450,000 user email addresses and passwords to be stolen from its user-generated content service, Yahoo! Voices. In a blog posting, Yahoo said that the "compromised information was provided by writers who had joined Associated Content prior to May 2010, when it was acquired by Yahoo!. (Associated Content is now the Yahoo! Contributor Network.) This compromised file was a standalone file that was not used to grant access to Yahoo! systems and services."

Phandroid has announced that a hacker has recently accessed its user database, making off with usernames, email addresses and hashed passwords—and the problem looks like it could affect all of its one million-plus users.

The company said that although the breached accounts include user names from Yahoo and other companies, only 5% of the accounts had valid passwords. Yahoo said it is working to fix the vulnerability and is changing the passwords of the affected users. The company also said it is notifying other companies whose users may have been affected -- earlier we reported that they may include people who use AOL, Gmail, Hotmail and many others.

Yahoo has been the victim of a security breach that yielded hundreds of thousands of login credentials stored in plain text. The hacked data, posted to the hacker site D33D Company, contained more than 453,000 login credentials and appears to have originated from the Web pioneer's network. The hackers, who said they used a union-based SQL injection technique to penetrate the Yahoo subdomain, intended the data dump to be a "wake-up call."

Yahoo Inc. said Thursday it is investigating reports of a security breach that may have exposed nearly half a million users' email addresses and passwords... The little-known group was quoted as saying that they had stolen the passwords using an SQL injection -- the name given to a commonly-used attack in which hackers use rogue commands to extract data from vulnerable websites.