Checking Exchange Online Email Addresses to Make Sure They’re Not Compromised

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Scammers and spammers love having large databases of email addresses to use for their nefarious purposes. Your Exchange Online addresses might be in those databases, so here’s how to check the email addresses for your mailboxes against the Have I been pwned (HIBP) service using some PowerShell.
https://www.petri.com/checking-office-365-email-addresses-compromise

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