F-SECURE ANTI-VIRUS FOR MICROSOFT EXCHANGE 8.00 - Administrator's Manual - page 176
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File Type Recognition
Intelligent file type
recognition
Select whether you want to use Intelligent File
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.
Trusted senders and recipients
List of trusted
senders
Specify senders who are excluded from the mail
scanning and processing.
List of trusted
recipients
Specify recipients who are excluded from the
mail scanning and processing.
For more information, see “
Options
Limit max levels of
nested messages
Specify how many levels deep to scan in nested
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.
It is not recommended to set the maximum
nesting level to unlimited as this will make the
product more vulnerable to DoS
(Denial-of-Service) attacks.