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Emails on my Exchange 2010 server do not have a SCL value or X-MS-Exchange-Organization-SCL: in the email header.

Does anyone know how to enable this so I can filter spam from my users


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Do you have anti-spam enabled in your Exchange Organization? As far as I know there is no specific parameter to enable or disable the anti-spam stamps, they are there as soon as you enable antispam content filters – the-wabbit Feb 3 '12 at 10:51

You can set both SCL and headers using Transport Rules.

In the Exchange Management Console, there are under Organization Configuration -> Hub Transport.

For setting SCL, in the Actions step, you should flag set the spam confidence level to value. For headers, the flag is set header with value.

enter image description here

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You can use this cmdlet in the Exchange Management Shell.

Set-ContentFilterConfig -SCLQuarantineEnabled $true -SCLRejectEnabled $true -SCLDeleteEnabled $true -SCLQuarantineThreshold 5 -SCLRejectThreshold 6 -SCLDeleteThreshold 8 -QuarantineMailbox -RejectionResponse "Message rejected due to content restrictions" -BypassedRecipients,
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