The Exchange Sender Reputation filter must be enabled.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-259614	EX19-ED-000128	SV-259614r961161_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 anti-spam 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 anti-spam 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 2019 Edge Server Security Technical Implementation Guide	2024-06-10

Details

Check Text ( C-63353r942154_chk )
Note: If third-party anti-spam product is being used, the anti-spam product must be configured to meet the requirement. Additionally, the default value for "Sender Reputation" is "True" for "Enabled". Open the Exchange Management Shell and enter the following command: Get-SenderReputationConfig \| Select-Object -Property Name, Enabled If the value of "Enabled" is not set to "True", this is a finding.

Check Text ( C-63353r942154_chk )

Note: If third-party anti-spam product is being used, the anti-spam product must be configured to meet the requirement.

Additionally, the default value for "Sender Reputation" is "True" for "Enabled".

Open the Exchange Management Shell and enter the following command:

Get-SenderReputationConfig | Select-Object -Property Name, Enabled

If the value of "Enabled" is not set to "True", this is a finding.

Fix Text (F-63261r942155_fix)
Open the Exchange Management Shell and enter the following command: Set-SenderReputationConfig -Enabled $true