Procedure

1. Choose Policy → Policy List from the menu.
2. Click Default spam rule → And scanning conditions match → Spam detection settings.
3. Configure spam detection settings.
   1. Under Spam/phishing emails on the scanning conditions selection screen, select the check box next to Spam detection settings.
   2. Click Spam detection settings.
      The Spam detection settings screen appears.
   3. To enable spam scanning, select the check box next to Select a spam catch rate or specify a detection threshold. If you do not select this check box, IMSVA will not label any email messages that violate this rule as spam. You can, however, still take actions on any senders in the Blocked Senders list below.
   4. Select one of the following spam catch rates or specify a detection threshold.
      • High: Catches more spam. Select a high catch rate if too much spam is getting through to your clients.
      • Medium: Select to catch an average amount of spam (the default selection).
      • Low: Catches less spam. Select a low catch rate if IMSVA is tagging too many legitimate email messages as spam.
      • Specify a detection threshold: You can specify a threshold value (between 3.0 and 10.0) that represents how critically IMSVA analyzes email messages to determine if they are spam.

      Note A higher threshold value means that a message must be very "spam-like" for IMSVA to consider it spam. This decreases the spam catch rate, but it also results in a lower number of false positives. If IMSVA is tagging too many legitimate email messages as spam (too many false positives), specify a higher threshold value. A lower threshold value means that a message only needs to be slightly "spam-like" for IMSVA to consider it spam. This increases the spam catch rate, but it also results in a higher number of false positives. If IMSVA is letting too much spam through to your clients as legitimate email, specify a lower threshold value.

   5. Select the check boxes next to any of the following lists to enable them:
      • Approved sender list: Prevents IMSVA from identifying email from senders in this list as spam.
      • Blocked sender list: Forces IMSVA to identify email from senders in this list as spam.
      • Text exemption list: Prevents IMSVA from identifying email that contains any of the text in this list as spam.

      Note For instructions on configuring the lists, see .

   6. Click Save.