There's no protocol-level communication that tells the sending system or sender that the message was deleted. SCL delete threshold: When the SCL value for a specific message is equal to or higher than the SCL delete threshold, the Content Filter agent deletes the message. To understand this functionality, it's helpful to understand the different SCL threshold actions and how they're implemented: Number of spam email messages that reach the Outlook user's Inboxīy adjusting SCL threshold actions, you can escalate the content filtering action taken on messages that have a greater risk of being spam.Number of offensive spam email messages that reach the Outlook user's Inbox or Junk Email folder.Number of legitimate email messages that reach the Microsoft Outlook user's Junk Email folder.Number of legitimate email messages mistakenly quarantined.By carefully adjusting the SCL threshold configuration, you can minimize the following: For more information about the order in which anti-spam agents process messages, see Anti-spam protection.īecause content filtering isn't an exact, deterministic process, the ability to adjust the action that the Content Filter agent performs on different SCL values is important. In Exchange 2013, these deterministic anti-spam agents process messages first and therefore greatly reduce the number of messages that must be processed by the Content Filter agent. The Sender Filter agent and Recipient Filter agent process messages in a similarly deterministic manner. For example, on an Edge Transport server the Connection Filter agent rejects any message sent from an IP address on a real-time block list. Many of the other anti-spam agents that process inbound messages before they're processed by the Content Filter agent are deterministic in how they act on a message. The Content Filter agent assigns an SCL rating to messages late in the anti-spam cycle, after other anti-spam agents have processed any inbound messages. This more precise and detailed SCL threshold adjustment functionality in Exchange 2013 can help you reduce the overall cost of deploying and maintaining an anti-spam solution across your Exchange organization. The combination of this SCL threshold configuration in the Content Filter agent and the SCL Junk Email folder configuration on the user's mailbox helps you implement a more comprehensive and precise anti-spam strategy. For example, you can define different thresholds for rejecting, deleting, or quarantining messages on an Exchange server that's running the Content Filter agent. In Microsoft Exchange Server 2013, you can define specific actions according to spam confidence level (SCL) thresholds. For more information, see Deprecating support for SmartScreen in Outlook and Exchange. The existing SmartScreen spam definitions will be left in place, but their effectiveness will likely degrade over time. On November 1, 2016, Microsoft stopped producing spam definition updates for the SmartScreen filters in Exchange and Outlook.
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