This article states:This warning indicates that although Content Filtering and the SCL Reject action are enabled, the SCL Reject action threshold is set to the default value of 9. This may cause rejection of messages that come from legitimate users. The recommended setting for the SCL Reject action threshold value is 7.To address this warning, set the value of the SCL Reject action threshold to 7 using the Anti-spam tab in the Exchange Management Console or by using the Set-ContentFilterConfig c
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