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1 spam confidence level
"The normalized value that is assigned to an e-mail message. This value indicates, based on the characteristics of the message, such as the content, message header, and so forth, the likelihood that the message is spam. This value is persisted with the message when the message is sent to other Exchange servers." -
2 spam confidence level threshold
"The level at which the content filter feature in Exchange Server takes a specific action on a specific message, such as rejecting a message or deleting a message."English-Arabic terms dictionary > spam confidence level threshold