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X-CAA-SPAM header value list?

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X-CAA-SPAM header value list?

I know this email header is added by Cloudmark Authority - which is an anti-spam service/filter that Comcast uses before emails hit our personal email accounts.


Is there any way to get a description of what the values in these headers mean?  Is there a distinct list, or is it some kind of score?


It would be great to understand this value-added service for those of us who would like to configure some more advanced filtering options at the inbox.


Thanks in advance!