Details
When sender reputation is enabled on a computer, sender reputation filters all messages from all Receive connectors on that computer. Only messages from external sources are filtered. External sources are defined as non-authenticated sources, which are considered anonymous Internet sources.
Rationale:
Spam consumes a large amount of network bandwidth and server capacity. In addition, it is often the source of malicious software.
Solution
To implement the recommended state, execute the following PowerShell cmdlet:
Set-SenderReputationConfig -SenderBlockingEnabled $true -OpenProxyDetectionEnabled $true
Supportive Information
The following resource is also helpful.
This security hardening control applies to the following category of controls within NIST 800-53: System and Information Integrity.This control applies to the following type of system Windows.