F-SECURE ANTI-VIRUS FOR MICROSOFT EXCHANGE Administrator's Manual page 181

Figure 6-1 Spam Control settings in a locally managed environment
Check messages for
spam
Enable heuristic
spam analysis
Administering F-Secure Spam Control
Specify whether inbound mails should be
scanned for spam.
Realtime Blackhole List (RBL) spam filtering is
not enabled by default even if you enable spam
filtering from the settings. For information on
configuring Realtime Blackhole Lists, see
Realtime Blackhole List Configuration
"
Specify whether heuristic spam analysis is used
to filter inbound mails for spam.
When the heuristic spam analysis is enabled, all
messages that the threat detection engine does
not classify as spam are further analyzed for
spam.
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