The Exchange Simple Mail Transfer Protocol (SMTP) Sender filter must be enabled.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-69899	EX13-EG-000260	SV-84521r1_rule		Medium

Description
Email system availability depends in part on best practices strategies for setting tuning configurations. Careful tuning reduces the risk that system or network congestion will contribute to availability impacts. Filters that govern inbound email evaluation can significantly reduce spam, phishing, and spoofed emails. Filters for messages from blank senders, known spammers, or zero-day attack modifications must be enabled to be effective. Failure to enable the filter will result in no action taken. This setting should always be enabled.

Description

Email system availability depends in part on best practices strategies for setting tuning configurations. Careful tuning reduces the risk that system or network congestion will contribute to availability impacts. Filters that govern inbound email evaluation can significantly reduce spam, phishing, and spoofed emails. Filters for messages from blank senders, known spammers, or zero-day attack modifications must be enabled to be effective. Failure to enable the filter will result in no action taken. This setting should always be enabled.

STIG	Date
MS Exchange 2013 Edge Transport Server Security Technical Implementation Guide	2017-01-04

Details

Check Text ( C-70367r1_chk )
Open the Exchange Management Shell and enter the following command: Get-SenderFilterConfig \| Select Name, Enabled If the value of Enabled is not set to True, this is a finding.

Fix Text (F-76129r1_fix)
Open the Exchange Management Shell and enter the following command: Set-SenderfilterConfig -Enabled $true