With the HPI Identity Leak Checker, it is possible to check whether your e-mail address, along with other personal data (e.g. telephone number, date of birth or address), has been made public on the Internet where it can be misused for malicious purposes.
"Top verified data leaks
Here we highlight some of largest-volume data leaks in our database and which have already been verified by the attacked site itself or by its community. Each of them has been made publicly available by the attackers themselves or by those affected through different websites. All this information can also be followed by RSS and Twitter."
"BrowserLeaks.com - It's all about Web Browser Fingerprinting. Here you will find the gallery of web browser security testing tools, that tell you what exactly personal identity data may be leaked without any permissions when you surf the Internet."
"Whonix is an operating system focused on anonymity, privacy and security. It's based on the Tor anonymity network[1], Debian GNU/Linux[2] and security by isolation. DNS leaks are impossible, and not even malware with root privileges can find out the user's real IP."