Free CompTIA CySA+ CS0-003 Practice Question

During an investigation of potential spear-phishing, a cybersecurity analyst reviews an email's technical details and notices the following in the message header: 'Authentication-Results:; auth=fail'. What does this most likely indicate about the email?

  • The message was sent using a misconfigured Simple Mail Transfer Protocol (SMTP) server, complicating deliverability.

  • The content of the message is encrypted, but the public key offered does not match the recipient's private key.

  • The email did not meet one or more authentication methods required by the recipient's domain, suggesting potentially fraudulent contents.

  • The email contains a reply-to address that does not match the sender address, which is commonly seen in legitimate automated messages.

This question's topic:
CompTIA CySA+ CS0-003 / 
Security Operations
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