F-SECURE ANTI-VIRUS FOR MICROSOFT EXCHANGE 8.00 Administrator's Manual page 242

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Increasing cache sizes may increase the threat
detection performance but it requires more disk
space and may degrade the threat detection
rate. Cache sizes can be disabled (set the size
to 0) for troubleshooting purposes.
Click
cache.
Spam Scanning
Spam detection Enable or disable the threat detection service
while scanning inbound messages for spam.
Action on connection Specify the action for messages when the threat
failure detection center cannot be contacted and the
threat detection engine cannot classify the
message.
Pass through - The message is passed through
without scanning it for spam.
Heuristic Scanning - F-Secure Content Scanner
Server checks the message using spam
heuristics.
Trusted networks Specify networks and hosts in the mail relay
network which can be trusted not to be operated
by spammers and do not have open relays or
open proxies.
Define the network as a network/netmask pair
(10.1.0.0/255.255.0.0), with the network/nnn
CIDR specification (10.1.0.0/16), or use '*'
wildcard to match any number and '-' to define a
range of numbers (172.16.*.1, 172.16.4.10-110).
Clear cache to clear the detection service