F-SECURE ANTI-VIRUS FOR MICROSOFT EXCHANGE 7.10 Administrator's Manual page 148

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Scan e-mail Enable or disable the virus scan. The virus scan
messages for viruses scans messages for viruses and other malicious
code.
Heuristic Scanning Enable or disable the heuristic scan. The
heuristic scan analyzes files for suspicious code
behavior so that the product can detect unknown
malware.
By default, the heuristic scan is enabled for
inbound mails and disabled for outbound and
internal mails.
The heuristic scan may affect the product
performance and increase the risk of false
malware alarms.
Sandbox Scanning Enable or disable the sandbox scan. The
sandbox scan emulates and analyzes the code
in a safe and isolated environment known as the
Sandbox.
By default, the sandbox scan is enabled for
inbound mails and disabled for outbound and
internal mails.
The sandbox scan may affect the product
performance. We recommend that you disable
the sandbox scan if you need the scan to be
faster.
Proactive virus threat Select whether Proactive Virus Threat Detection
detection is enabled or disabled.
Proactive virus threat detection can identify new
and unknown e-mail malware, including viruses
and worms.