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.
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WARNING
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For the actions specified in Scan
Exceptions to take effect, verify that the Global antivirus rule
is enabled.
-
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.
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