F-SECURE ANTI-VIRUS - FOR MICROSOFT EXCHANGE Administrator's Manual page 136

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Options
Heuristic spam Specify whether heuristic spam analysis is used
analysis to filter inbound mails for spam.
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. 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.
Click
filtering options:
Max message size - Specify the maximum size
(in kilobytes) of messages to be scanned for
spam. If the size of the message exceeds the
maximum size, the message is not filtered for
spam.
More options to configure advanced spam