These lists are rarely the result of a direct hack on a mail provider like Gmail or Outlook. Instead, they are usually compiled through:
Use Multi-Factor Authentication (App-based is best) to ensure that even if someone has your password, they cannot gain access. 6k usa have mail access.txt
Using the verified accounts to send spam or phishing emails to the victim's contact list, as these emails are less likely to be flagged by spam filters since they come from a legitimate address [3, 4]. These lists are rarely the result of a
Using malware (Infostealers) that grabs passwords saved in a user's browser [6, 7]. Security Recommendations If you suspect your information is on such a list: Using malware (Infostealers) that grabs passwords saved in
Harvesting personal information, tax documents, or private communications found within the inbox [2, 5]. How These Lists Are Created
Use services like Have I Been Pwned to see if your email has appeared in recent leaks.