Setting Affecting Aggressiveness of Spam Detection

B.

The setting that affects the aggressiveness of spam detection in the Cisco Email Security Appliance is the spam threshold.

The spam threshold setting is used to control the level of sensitivity of the spam filter. It determines the level of scrutiny that the appliance applies to incoming emails in order to identify and classify them as either spam or legitimate email.

A lower spam threshold will result in a more aggressive spam detection approach, where more emails will be flagged as spam and either quarantined or discarded. This may lead to a higher rate of false positives, where legitimate emails are mistakenly identified as spam and prevented from reaching their intended recipients.

Conversely, a higher spam threshold will result in a less aggressive approach, where fewer emails will be flagged as spam. This may lead to a higher rate of false negatives, where spam emails are not detected and allowed to reach the recipients' inboxes.

The protection level setting, on the other hand, controls the overall security posture of the appliance, including settings related to virus detection and outbreak filters.

The spam timeout setting controls how long an email will be held in the spam quarantine before being automatically deleted. The maximum depth of recursion scan setting determines the number of layers deep the appliance will scan an email message for spam or other malicious content.

Therefore, the correct answer to the question is B. spam threshold.