The Exchange Sender Reputation filter must be enabled.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-221237	EX16-ED-000380	SV-221237r612603_rule		Medium

Description
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.

Description

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.

STIG	Date
Microsoft Exchange 2016 Edge Transport Server Security Technical Implementation Guide	2020-12-10

Details

Check Text ( C-22952r411837_chk )
Note: If third-party anti-spam product is being used, the anti-spam product must be configured to meet the requirement. 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 (F-22941r411838_fix)
Open the Exchange Management Shell and enter the following command: Set-SenderReputationConfig -Enabled $true