F-SECURE ANTI-VIRUS - FOR MICROSOFT EXCHANGE Administrator's Manual - page 48
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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.
Action on Mails with
Exceeding Nesting
Levels
Specify the action to take on messages with
nesting levels exceeding the upper level
specified in the Max Levels of Nested Messages
setting.
Drop the Whole Message - Messages with
exceeding nesting levels are not delivered to the
recipient.
Pass Through - Nested messages are scanned
up to level specified in the Max Levels of Nested
Messages setting. Exceeding nesting levels are
not scanned, but the message is delivered to the
recipient.