Specifying Sender Filtering Spam Settings Parent topic

Procedure

  1. Go to Sender FilteringRules.
    The Rules screen appears with 4 tabs, one for each type of threat.
  2. Click the Spam tab.
    The Spam screen appears.
  3. Select the Enable check box to enable blocking of spam.
  4. Specify a value for the following:
    • Duration to monitor: The number of hours that IMSS monitors email traffic to see if the percentage of spam messages exceeds the threshold you set.
    • Rate (%): The maximum number of allowable messages with spam threats.
    • Total messages: The total number of spam messages out of which the threshold percentage is calculated.
    Consider the following example:
    Duration to monitor: 1 hour at a rate of 20 out of 100.
    During each one-hour period that spam blocking is active, IMSS starts blocking IP addresses when more than 20% of the messages it receives contain spam and the total number of messages exceeds 100.
  5. Next to Triggering action, select one of the following:
    • Block temporarily: Block messages from the IP address temporarily and allow the upstream MTA to try again after the block duration ends.
    • Block permanently: Never allow another message from the IP address and do not allow the upstream MTA to try again.
  6. Optional: If you select Block temporarily, specify the block duration.
  7. Click Save.