220.127.116.11 PidTagContentFilterSpamConfidenceLevel Property
The PidTagContentFilterSpamConfidenceLevel property ([MS-OXPROPS] section 2.643) indicates the likelihood that the e-mail message is spam. The value MUST be in the range -1 to 9 (inclusive). The value -1 indicates that the message is not spam, and a value greater than -1 indicates that the message likely is spam. The greater the number, the higher the likelihood that the message is spam, with 9 indicating the highest likelihood. This property SHOULD be set by the server's spam filter before the Junk Email rule is executed.