F-SECURE ANTI-VIRUS - FOR MICROSOFT EXCHANGE Administrator's Manual page 170

170
Using Intelligent File Type Recognition
strengthens the security, but can degrade the
system performance.
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.
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.