Collection #1 (unverified): In January 2019, a large collection of credential stuffing lists (combinations of email addresses and passwords used to hijack accounts on other services) was discovered being distributed on a popular hacking forum. The data contained almost 2.7 billion records including 773 million unique email addresses alongside passwords those addresses had used on other breached services. Full details on the incident and how to search the breached passwords are provided in the blog post The 773 Million Record "Collection #1" Data Breach.
Compromised data: Email addresses, Passwords

Lifeboat: In January 2016, the Minecraft community known as Lifeboat was hacked and more than 7 million accounts leaked. Lifeboat knew of the incident for three months before the breach was made public but elected not to advise customers. The leaked data included usernames, email addresses and passwords stored as straight MD5 hashes.
Compromised data: Email addresses, Passwords, Usernames
Das könnte erklären, warum jmd aus Russland meine E-Mail wusste und bei Warframe ausprobiert hat 
