Which of the following are effective email controls?

The option highlighting spam filtering, antivirus solutions, monitoring outbound traffic, and training employees on the secure use of personal email represents a comprehensive approach to email security.

Spam filtering is crucial as it helps block unsolicited or malicious emails that could include phishing attempts or malware attachments, thereby reducing the attack surface significantly. Antivirus software provides an additional layer of protection by scanning attachments and links within emails, detecting and preventing potential malware infections before they can compromise systems.

Monitoring outbound traffic is essential for identifying any unauthorized data exfiltration, which can occur when sensitive information is sent out via email without proper authorization or when accounts are compromised. This proactive measure helps organizations respond timely to security incidents.

Training employees on the secure use of personal email addresses is important because many security breaches occur due to human error. Educating employees about best practices in email usage can prevent risks associated with insecure behaviors, like using work-related information on personal email accounts that lack the same security measures as organizational accounts.

This holistic mix of technical solutions and user education effectively addresses various facets of email security, making this option the most well-rounded and impactful choice for effective email controls.