Question: An organization is experiencing issues with emails that are being sent to external recipients. Incoming emails to the organization are working fine. A security analyst

An organization is experiencing issues with emails that are being sent

An organization is experiencing issues with emails that are being sent to external recipients. Incoming emails to the organization are working fine. A security analyst receives the following screenshot of an email error from the help desk: Mail delivery failed: Returning message to sender A message could not be delivered to one or more of its recipients SMTP Error from remote mail server after RCPT TO: someone@example.com The analyst then checks the email server and sees many of the following messages in the logs: Error 550 2 Message rejected - Which of the following is MOST likely the issue? A. SPF is failing. B. The DMARC queue is full. C. The DKIM private key has expired. D. Port 25 is not open

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