F-SECURE ANTI-VIRUS FOR MICROSOFT EXCHANGE 8.00 Administrator's Manual page 92

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Zero-Day Protection
Grayware Scanning
Select whether Proactive Virus Threat Detection is enabled or disabled.
Proactive virus threat detection can identify new and unknown e-mail
malware, including viruses and worms.
When proactive virus threat detection is enabled, the product analyzes
e-mail messages for possible security threats. All possibly harmful
messages are quarantined as unsafe.
Unsafe messages can be reprocessed periodically, as antivirus updates
may confirm the unsafe message as safe or infected.
When proactive virus threat detection is disabled, mails are only scanned
by antivirus engines.
Specify how the product processes grayware items in inbound, outbound
and internal messages.
Note that grayware scanning increases the scanning overhead. By
default, grayware scanning is enabled for inbound messages only.
Grayware scanning is disabled when virus scanning is disabled.
Scan Messages for
Grayware
Action on Grayware
Enable or disable the grayware scan.
The default value is Enabled for inbound
messages and Disabled for outbound and
internal messages.
Specify the action to take on items which contain
grayware.
Pass Through - Leave grayware items in the
message.