The current rule is as follows:

• File Submission Quota = seat x 0.1 in 24 hours slide windows
   

  The quota will be 5 if the seat number is less than 50.

   
• URL Submission Quota = seat x 8 in 24 hours slide windows

As an example, if the customer seat number is 1000:

• The quota of file submitted to sandbox = 100 in 24 hours slide windows
• The quota of URL submitted to sandbox = 8000 in 24 hours slide windows

Sample hits the local or cloud cache, or Risk Rating value of error (<0) will not cost the quota.

To know if the quota has been reached, do either of the following:

• Check the "Virtual Analyzer Quota Usage Details" Dashboard.

  

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• Under Policy Events, query by Threat type "Scan Exception" and subtype "Virtual Analyzer submission quota exception".

To verify why a specific mail was not sent to the Virtual Analyzer, you can check the "Mail Tracking Details" page which should give you a clue.

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For file or URL submissions over quota, you can configure scan exception actions and decide how you want such mails to be handled. For details, see Configuring "Scan Exceptions" Actions.