If you have the Forcepoint Email Security Image Analysis Module, you can choose to quarantine messages that have images attached to prevent potentially pornographic images from entering your organization. Messages are quarantined if they contain an image attachment considered to be inappropriate. This can be set up for inbound messages, outbound messages, or both.

To quarantine images, select Quarantine messages containing inappropriate images, and define how strictly the system applies this security feature by selecting a sensitivity level. By changing the sensitivity, you can control how suspicious the image scanner is when it carries out its analysis.

It is difficult to impose absolute thresholds on what constitutes an "inappropriate" image, as perceptions can vary. Therefore depending on the sensitivity level you select, you may see a proportion of messages containing acceptable images being quarantined. If there are images that you don't want to be analyzed and quarantined, perhaps because they are repeatedly blocked, you can add them to the image allowlist. See Image allowlist and Managing quarantined images.

If a message includes an image attachment that Forcepoint Email Security Cloud cannot analyze, perhaps because it is too large, you can select Quarantine messages with images that could not be analyzed to quarantine that message for further analysis.