Sender reputation must be configured.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
Exch-ED-234	Exch-ED-234	Exch-ED-234_rule		Medium

Description
By performing filtering at the perimeter, up to 90% 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 threshold at which an email will be considered spam.

Description

By performing filtering at the perimeter, up to 90% 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 threshold at which an email will be considered spam.

STIG	Date
Microsoft Exchange 2010 Edge Transport Server Role	2012-05-31

Details

Check Text ( C-_chk )
Open the Exchange Management Shell and enter the following command. Get-SenderReputationConfig \| Select SrlBlockThreshold If the value of " SrlBlockThreshold" is not set to "6" or less, this is a finding.

Fix Text (F-_fix)
Open the Exchange Management Shell and enter the following command. Set-SenderReputationConfig -SrlBlockThreshold 6 -SenderBlockingPeiod 36