Exchange must have anti-spam filtering enabled.

From Microsoft Exchange 2016 Mailbox Server Security Technical Implementation Guide

Part of SRG-APP-000261

Associated with: CCI-001308

SV-95413r1_rule Exchange must have anti-spam filtering enabled.

Vulnerability discussion

Originators of spam messages are constantly changing their techniques in order to defeat spam countermeasures; therefore, spam software must be constantly updated to address the changing threat. A manual update procedure is labor intensive and does not scale well in an enterprise environment. This risk may be mitigated by using an automatic update capability. Spam protection mechanisms include, for example, signature definitions, rule sets, and algorithms.Exchange 2016 provides both anti-spam and anti-malware protection out of the box. The Exchange 2016 anti-spam and anti-malware product capabilities are limited but still provide some protection.

Check content

Review the Email Domain Security Plan (EDSP). 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 (NA). Open the Exchange Management Shell and enter the following command: Get-ContentFilterConfig | Format-Table Name,Enabled; Get-SenderFilterConfig | Format-Table Name,Enabled; Get-SenderIDConfig | Format-Table Name,Enabled; Get-SenderReputationConfig | Format-Table Name,Enabled If any of the following values returned are not set to "True", this is a finding: Set-ContentFilterConfig Set-SenderFilterConfig Set-SenderIDConfig Set-SenderReputationConfig

Fix text

Update the EDSP with the anti-spam mechanism used. Open the Exchange Management Shell and enter the following command for any values that were not set to "True": Set-ContentFilterConfig -Enabled $true Set-SenderFilterConfig -Enabled $true Set-SenderIDConfig -Enabled $true Set-SenderReputationConfig -Enabled $true

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