If you use any of these providers, update your password immediately to something unique.
"Mail:Pass" means the file is formatted as email@example.com:password123 , making it ready for immediate use in hacking tools.
Attackers gain full access to your email, allowing them to reset passwords for other linked accounts.
Websites hosting these "leaks" often bundle the download with Malware or Stealer Logs designed to infect your own computer the moment you open the .txt file.