F-SECURE ANTI-VIRUS - FOR MICROSOFT EXCHANGE Administrator's Manual - page 44
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If you enable the heuristic spam analysis, all
messages that the threat detection engine does
not classify as spam are further analyzed for
spam.When the heuristic spam analysis is
disabled, only the threat detection engine filters
messages for spam.
Heuristic spam analysis slows down the
performance but improves the spam detection
rate.
Spam Filtering Level
Specify the spam filtering level. All messages
with the spam filtering level lower than the
specified value can pass through.
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.
Action on Spam
Messages
Specify actions to take with messages
considered as spam, based on the spam filtering
level.
Quarantine - Place the message into the
quarantine folder.
Forward - Forward the message to the e-mail
address specified in the Forward Spam
Messages To E-mail Address setting.
Delete - Delete the message.