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ISC2 Systems Security Certified Practitioner (SSCP) Practice Question

Your company hosts its email system in AWS using an EC2-based Postfix gateway that relays messages to Amazon WorkMail. A recent surge of unsolicited bulk email is saturating the antivirus and content-filtering containers that run after the gateway, driving CPU utilization to 90 %. What change to the Postfix configuration will most effectively reduce the spam load before it reaches the resource-intensive scanners, while preserving delivery of legitimate mail?

  • Implement greylisting so the gateway temporarily defers every message from unknown senders

  • Deploy spam-filtering plug-ins to all user email clients instead of filtering on the gateway

  • Restrict inbound SMTP to the company's partner IP ranges and drop all other connections

  • Enable DNS-based blockhole list (DNSBL) lookups at the Postfix SMTP connection stage to reject listed senders

ISC2 Systems Security Certified Practitioner (SSCP)
Systems and Application Security
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