Have I Been Sold? is a free service which lets you check our database of purchased emails and see if someone sold your contact information.
Have I Been Pwned? will inform you if one of your accounts was compromised. They've cataloged over 4.9 Billion hacked accounts.
HackNotice alerts you when your information has been disclosed in leaked data breaches from hacked sites.
HackNotice does this by collecting leaked information from data breaches and compiling it into a database that can be used to determine if information related to your monitored email addresses have been leaked.