Yahoo will face a US class action lawsuit for allegedly accessing the content of emails sent to its mail users from non-Yahoo Mail accounts.
A Californian judge ruled that people who sent emails to or received emails from Yahoo Mail users from 2nd October 2011 can sue the company as a group, granting it class action status.
There is estimated to be over one million members in the privacy lawsuit.
Yahoo is accused of using the data to boost advertising revenue.
The non-Yahoo Mail users said the company intercepted and analyzed their emails, along with attachments with the goal of creating "targeted advertising" for its 275 million mail subscribers.