A cybersecurity analyst is recommending a solution to ensure emails that contain links or attachments are tested before they reach a mail server. Which of the following will the analyst most likely recommend?

Multi-Factor Authentication (MFA) adds an extra layer of security by requiring users to provide multiple credentials to access systems or data. While MFA strengthens authentication processes, it does not directly address the specific concern of testing email content for potential threats before reaching the mail server.

DomainKeys Identified Mail (DKIM) is an email authentication method that uses cryptographic signatures to verify the authenticity of email messages. While DKIM helps prevent email spoofing and phishing attacks, it does not involve testing email links or attachments for potential threats before they reach the mail server.

Vulnerability scans are assessments that identify weaknesses in a system's security posture by scanning for known vulnerabilities. While vulnerability scans are essential for overall cybersecurity hygiene, they do not specifically address the need to test email content for potential threats before it enters the mail server.