Exchange must have anti-spam filtering installed.

Severity
Group ID
Group Title
Version
Rule ID
Date
STIG Version
mediumV-259626SRG-APP-000261EX19-ED-000140SV-259626r961161_rule2024-12-062
Description
Originators of spam messages are constantly changing their techniques to defeat spam countermeasures; therefore, spam software must be constantly updated to address the changing threat. Spam protection mechanisms include, for example, signature definitions, rule sets, and algorithms. Exchange 2019 provides both anti-spam and anti-malware protection out of the box. The Exchange 2019 anti-spam and anti-malware product capabilities are limited but still provide some protection.
ℹ️ Check
Review the Email Domain Security Plan (EDSP) for an installed anti-spam product. Note: If using another DOD-approved anti-spam product for email or a DOD-approved Email Gateway spamming device, such as Enterprise Email Security Gateway (EEMSG), this is not applicable. Open the Exchange Management Shell and enter the following command: Get-ContentFilterConfig | Format-Table Name, Enabled If no value is returned, this is a finding.
✔️ Fix
Install the anti-Spam module. Open the Exchange Management Shell and enter the following command: & $env:ExchangeInstallPath\Scripts\Install-anti-SpamAgents.ps1