A security flaw in Thunderbird email client has been publicly disclosed. Mike Cardwell, a developer, IT consultant, sysadmin and security researcher in the UK, has discovered a security leak in the free email client. He reported the security flaw to Mozilla in November 2011, but it has not been fixed yet. Cardwell has moved away from using Thunderbird to use the desktop email client Evolution instead of Thunderbird. He has also discovered numerous security and privacy flaws in the client, as well as contributing rulesets to HTTPS Everywhere.”]