For each notification address, you may specify a severity rule to determine whether a given notification message is sent to this address. If the message's severity satisfies the criterion for the address, it is sent to that address; otherwise it is not. 

To define a severity restriction for the address, set a severity comparison and a UseForSeverity value. For example, to only notify this address for messages with a severity >=8, set UseForSeverityComparison to compGE and UseForSeverity to 8.

Set the value to compUnspecified to not use a severity rule for this address.

INotificationAction.Severity,IFileCaptureAction.Severity