Procedure

1. Create or modify an Other (not an Antivirus) policy.
   • For information on creating a new rule, see Adding Policies.
   • For information on modifying an existing rule, see Modifying Existing Policies.
2. Under Web Reputation on the Scanning Conditions screen, select Web Reputation settings.
3. Click Web Reputation Settings.
   The Web Reputation Settings screen appears.
4. Select one of the following security levels.
   • High: Blocks more websites embedded in messages but also increases the risk of false positives. Select High if your users are visiting too many malicious websites.
   • Medium: Blocks an average number of malicious websites. Medium is the default setting because it blocks most web threats while keeping the false positive count low.
   • Low: Blocks fewer websites embedded in messages and reduces the risk of false positives. Select Low if IMSVA is blocking too many legitimate websites.
5. Select the action to take if IMSVA detects URLs that have not been tested by Trend Micro.
   • Bypass: Bypasses email messages that contain the URLs.
   • Apply the policy action: Applies the action specified in the policy.
   • Submit to Virtual Analyzer: Submits the URLs to Virtual Analyzer for further analysis.
6. Select Enable Time-of-Click Protection and click one of the following:
   • Apply to URLs that have not been tested by Trend Micro
   • Apply to URLs marked by Web Reputation Services with smart flags
   • Apply to all URLs

   Note A smart flag is an indicator for rewriting URLs in email messages, which leverages correlation intelligence of Trend Micro Smart Protection Network to detect suspicious and malicious Web threat behaviors.

7. Optional: Select Apply to URLs in digitally signed messages if necessary.

   Note Enabling Time-of-Click Protection for digitally signed messages is not recommended because digital signatures might be destroyed.

8. Select Enable the use of the Web Reputation Approved List to prevent IMSVA from scanning and blocking domains included in the Web Reputation Approved List.
9. Click Save.