F-SECURE ANTI-VIRUS FOR MICROSOFT EXCHANGE 7.10 Administrator's Manual page 260

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The allowed values are from 0 to 9, the default
value is 5.
Action on Spam Specify the action to take with a message
Messages considered spam based on the spam filtering
level.
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.
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
The default value is Enabled.
Add X-Header with Specify if the summary of triggered hits is added
Summary to the mail as X-Spam-Status header in the
following format:
where
The default value is Enabled.
X-Spam-Flag:<flag>
<flag> is YES or NO,
X-Spam-Status: <flag>, hits=<scr>
required=<sfl> tests=<tests>
<flag> is Yes or No,
<scr> is the spam confidence rating
returned by the spam scanner,
<sfl> is the current spam filtering level,
<tests> is the comma-separated list of
tests run against the mail.