F-SECURE ANTI-VIRUS FOR MICROSOFT EXCHANGE 7.10 Administrator's Manual page 124

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Suspect Max Nested
Archives
Suspect Password
Protected Archives
Acceptable Unpacked
Size Threshold
Specify the number of levels F-Secure
Content Scanner Server goes through
before the action selected in Suspect Max
Nested Archives takes place. The default
setting is 3.
Increasing the value increases the load on
the system and thus decreases the overall
system performance. This means that the
system becomes more vulnerable for denial
of service attacks.
If the amount of nested archives exceeds the
value specified in the Max Levels in Nested
Archives, the file is stopped if Treat as
Unsafe is selected. If Treat as Safe is
selected, the archive file is sent to the user.
Compressed archive files can be protected
with passwords. These archives can be
opened only with a valid password, so
F-Secure Content Scanner Server cannot
scan their content. Password protected
archives can be stopped by selecting Treat
as Unsafe. If Treat as Safe is selected,
password protected archives are delivered to
recipient.
Specify the acceptable unpacked size (in
kilobytes) for archive files. If the unpacked
size of an archive file exceeds this threshold,
the server will consider the archive
suspicious and corresponding action will be
taken.