The Exchange Sender Reputation filter must be enabled.

From MS Exchange 2013 Edge Transport Server Security Technical Implementation Guide

Associated with: CCI-001308

SV-84493r1_rule The Exchange Sender Reputation filter must be enabled.

Vulnerability discussion

By performing filtering at the perimeter, up to 90 percent of spam, malware, and other undesirable messages are eliminated from the message stream rather than admitting them into the mail server environment. Sender Reputation is antispam functionality that blocks messages according to many characteristics of the sender. Sender Reputation relies on persisted data about the sender to determine what action, if any, to take on an inbound message. This setting enables the Sender Reputation function.

Check content

Open the Exchange Management Shell and enter the following command: Get-SenderReputationConfig | Select Name, Enabled If the value of Enabled is not set to True, this is a finding.

Fix text

Open the Exchange Management Shell and enter the following command: Set-SenderReputationConfig -Enabled $true

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