https://yahoo.com/security-update "Law enforcement provided Yahoo in November 2016 with data files that a third party claimed was Yahoo user data. We analyzed this data with the assistance of outside forensic experts and found that it appears to be Yahoo user data. Based on further analysis of this data by the forensic experts, we believe an unauthorized third party, in August 2013, stole data associated with more than one billion user accounts. ....For potentially affected accounts, the stolen user account information may have included names, email addresses, telephone numbers, dates of birth, hashed passwords (using MD5) and, in some cases, encrypted or unencrypted security questions and answers. The investigation indicates that the stolen information did not include passwords in clear text, payment card data, or bank account information. So, some suggestions if you have a Yahoo account (also used to log onto Flickr) - change your Yahoo password and change the security questions and answers associated with the Yahoo account. If you have used the same password and/or similar security questions and answers for other online accounts, you should change those also. - review your Yahoo Mail settings to see if there are any changes you didn't configure (for example filters for forwarding emails) - Look to enable additional security features on your Yahoo account like two factor verification (aka two factor authentication). Two factor authentication is a method used by many online services to verify the users' identity using two methods, usually a password and a security code sent to or generated from your mobile device or other trusted device. See https://help.yahoo.com/kb/account on how to do so. Yahoo also offers a feature called Yahoo Account Key which uses your phone to authenticate you without a password. Dev Anand