What to do if your email address is leaked - Microsoft Support
Even if a file only contains email addresses, scammers use them to send highly personalized "spear-phishing" emails that look like legitimate Microsoft security alerts. How to Protect Your Hotmail Account Download 472k hotmail txt
Malicious actors may use Right-to-Left Override (RLO) technology to make a dangerous file like ReadMe_txt.exe appear as ReadMe_knl.txt to trick users into running code. What to do if your email address is