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The Exchange Spam Evaluation filter must be enabled.


Overview

Finding ID Version Rule ID IA Controls Severity
V-69877 EX13-EG-000205 SV-84499r1_rule Medium
Description
By performing filtering at the perimeter, up to 90 percent of spam, malware, and other undesirable messages may be eliminated from the transport message stream, preventing their entry into the Exchange environment. This significantly reduces the attack vector for inbound email-borne spam and malware. Spam Evaluation filters scan inbound email messages for evidence of spam and other attacks that primarily use "social engineering" techniques. Upon evaluation completion, a rating is assigned to each message estimating the likelihood of its being spam. Upon arrival at the destination mailbox, the junk mail filter threshold (also configurable) determines whether the message will be withheld from delivery, delivered to the junk mail folder, or delivered to the user’s inbox.
STIG Date
MS Exchange 2013 Edge Transport Server Security Technical Implementation Guide 2019-03-11

Details

Check Text ( C-70345r1_chk )
Open the Exchange Management Shell and enter the following command:

Get-ContentFilterConfig | Select Name, Identity, Enabled

If the value of Enabled is not set to True, this is a finding.
Fix Text (F-76107r1_fix)
Open the Exchange Management Shell and enter the following command:

Set-ContentFilterConfig -Enabled $true