Exceptions

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There are formal conditions, allowing classifying a letter before deep content analysis. The following conditions are checked:

• Don't filter large messages.
  The messages larger than specified size will not be filtered.
  
  
• Don't filter the messages with certain attachments.
  There are types of files, which almost never been used in spam. You can define a list of "white" file extensions. The filter will pass the message if it has at least one attachment of the listed type. You can also define the minimum size of attachments to consider as white.