F-SECURE ANTI-VIRUS FOR MICROSOFT EXCHANGE 7.10 Administrator's Manual page 264

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Spam filtering level Specify the spam filtering level. Decreasing the
level allows less spam to pass, but more regular
mails may be falsely identified as spam.
Increasing the level allows more spam to pass,
but a smaller number of regular e-mail
messages are falsely identified as spam.
For example, if the spam filtering level is set to 3,
more spam is filtered, but also more regular
mails may be falsely identified as spam. If the
spam filtering level is set to 7, more spam may
pass undetected, but a smaller number of
regular mails will be falsely identified as spam.
The allowed values are from 0 to 9, the default
value is 5.
Spam Confidence Click
Level (SCL) messages with the spam level above the
specified Spam Filtering Level.
Speficy the spam level and select action to take:
Quarantine - Place the message into the
quarantine folder.
Forward - Forward the message to an e-mail
address specified in the Forward Spam
Messages To E-mail Address setting.
Delete - Delete the message.
By default, spam messages are passed through.
Actions on passed through messages
Add X-Header with Specify if a spam flag is added to the mail as the
spam flag X-Spam-Flag header in the following format:
where
Add new action... to add a new action for
X-Spam-Flag:<flag>
<flag> is YES or NO,