Have I Been Pwned (HIBP) contains seemingly "fake" email addresses because it extracts any string matching valid email format (alias@domain.tld) from breach data, without verifying if actual mailboxes exist behind them. These addresses appear in breaches because websites often store unverified email addresses in their databases

5m read timeFrom troyhunt.com
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What is an Email Address?How Do "Fake" Email Addresses End up in Real Websites?How Can I Be Really Sure Actual Fake Addresses Aren't in HIBP?Conclusion
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