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Under certain circumstances, you may want to prevent IMSS from scanning certain types of messages that could be part of a DoS attack. For example, messages with extremely large attachments require significant IMSS server resources to scan fully. Additionally, messages addressed to hundreds of recipients are most likely spam or some type of attack.
Rather than consuming IMSS resources to scan these types of messages, set scan exceptions to bypass scanning and instruct IMSS to take action on the messages immediately.
WARNING
WARNING
  1. For the actions specified in Scan Exceptions to take effect, verify that the Global antivirus rule is enabled.
  2. For malformed messages, when a message triggers the scan exception, IMSS stops scanning and takes the corresponding actions. That means IMSS will not trigger any policy rules when a scan exception occurs.
For security setting violations and encryption exceptions, IMSS will not stop scanning after the action of the scan exception executes. IMSS continues checking other policy rules. IMSS will stop scanning if it encounters a terminal scan action.
Related information
Keywords: configure,scan exceptions