Sometimes emails lists are stolen i.e. someone hacks Netflixs and steals database that lists all emails.
Other times emails are sold – i.e. Netflix approaches Fuckbook and says “Hey, we have a list of 10,000 emails with confirmed users, we can sell it to you for $500”.
The only way to prevent this is to use a separate email for each and every service you use, and point them all to a single “hidden” email that you never share with everyone. Its a massive hassle however, and not worth it for 99% of users.
What you can do however is use three emails – one that you only use for business and official stuff, and never share with anyone outside of that. One more that you use for personal stuff – i.e. family, friends. ANd one throwaway one that you use to register on websites like Facebook etc.
Once the email has been leaked, there’s nothing you can do.
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