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TrendAI™ Email Security allows you to configure different types of exceptions. If an email message meets any of the following conditions, TrendAI™ Email Security will trigger an exception and take the specified actions:
  • The number of files in a compressed file exceeds 353.
  • The decompression ratio of a compressed file exceeds 100.
    Note
    Note
    The decompression ratio refers to the ratio between a decompressed file's size and its original compressed size. For example, for a 1 MB compressed file, if the decompressed file size is 100 MB, the ratio would be 100 to 1, which is equivalent to 100.
  • The number of decompression layers in a compressed file exceeds 20.
    TrendAI™ Email Security checks for malware "smuggled" within nested compressions and supports scanning up to 20 recursive compression layers.
  • The size of a single decompressed file exceeds 60 MB.
  • An Office file of version 2007 or later contains more than 353 subfiles.
    Note
    Note
    An Office file of version 2007 or later is actually a zip archive of XML files. Therefore, TrendAI™ Email Security treats such an Office file as a compressed file and triggers an exception when the Office file consists of more than 353 files.
  • An Office file of version 2007 or later contains a subfile whose decompression ratio exceeds 100.
  • Malformed messages.
  • Virtual Analyzer scan exception.
    Possible scenarios include:
    • Cloud sandbox analysis timed out.
    • Unable to connect to the cloud sandbox.
    • The available sandbox images do not support the file format.
    • The extracted or downloaded file exceeds the file size limit.
    • Unable to access the URL.
    • The URL is invalid.
  • Virtual Analyzer submission quota exception.
Note
Note
The Virtual Analyzer scan exception and submission quota exception are available only in inbound protection.
These settings are not included in theTrendAI™ Email Security Standard license.
For details about different license versions, see Available license versions.
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