Selecting Scanning Conditions for Spam

Spam criteria includes a spam catch rate/detection threshold setting and configurable lists for approved and blocked senders and for text exemption rules.

To configure spam scanning conditions:

  1. Under Spam/phishing emails on the scanning conditions selection screen for the Other rule type, 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, InterScan™ Messaging Security Appliance (IMSA) 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.

(click here for more information)   A higher threshold value means that a message must be very "spam-like" for IMSA to consider it spam. This decreases the spam catch rate, but it also results in a lower number of false positives. If IMSA 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 IMSA to consider it spam. This increases the spam catch rate, but it also results in a higher number of false positives. If IMSA is letting too much spam through to your clients as legitimate email, specify a lower threshold value.

  1. Select the check boxes next to any of the following lists to enable them:

  2. Approved sender list—Prevents IMSA from identifying email from senders in this list as spam.

  3. Blocked sender list—Forces IMSA to identify email from senders in this list as spam.

  4. Text exemption list—Prevents IMSA from identifying email that contains any of the text in this list as spam.

For instructions on configuring the lists, see Configuring Approved and Blocked Sender Lists.

  1. Click Save to continue selecting scanning conditions.

 

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