haveibeenpwned.com is useful for this
It told me that my email address was revealed in the Neteller hack:
Quote:
Neteller: In May 2010, the e-wallet service known as Neteller suffered a data breach which exposed over 3.6M customers. The breach was not discovered until October 2015 and included names, email addresses, home addresses and account balances.
Compromised data: Account balances, Dates of birth, Email addresses, Genders, IP addresses, Names, Phone numbers, Physical addresses, Security questions and answers, Website activity