F-SECURE ANTI-VIRUS FOR MICROSOFT EXCHANGE 7.10 Administrator's Manual page 176

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Only recent messages - Scan only messages
that have not been scanned during the previous
manual scanning.
File Type Recognition
Intelligent file type Select whether you want to use Intelligent File
recognition Type Recognition or not.
Trojans and other malicious code can disguise
themselves with filename extensions which are
usually considered safe to use. Intelligent File
Type Recognition can recognize the real file type
of the message attachment and use that while
the attachment is processed.
Using Intelligent File Type Recognition
strengthens the security but can degrade the
system performance.
Options
Limit max levels of Specify how many levels deep to scan in nested
nested messages e-mail messages. A nested e-mail message is a
message that includes one or more e-mail
messages as attachments. If zero (0) is
specified, the maximum nesting level is not
limited.