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Review the challenge brief, files, and requirements.
You receive a suspicious email claiming to be from your CEO. Analyze these headers:
From: John Smith <[email protected]>
Received: from mail.yourcompany.com (192.168.1.10)
by mx.google.com with SMTP
Received: from smtp.external-mail.net (203.0.113.50)
by mail.yourcompany.com with ESMTP
Authentication-Results: mx.google.com;
spf=none [email protected];
dkim=pass header.d=yourcompany.com;
dmarc=fail (p=none)
What is the strongest indicator that this email is spoofed?
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