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


Finding ID Version Rule ID IA Controls Severity
V-259625 EX19-ED-000139 SV-259625r942189_rule Medium
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.
Microsoft Exchange 2019 Edge Server Security Technical Implementation Guide 2024-01-10


Check Text ( C-63364r942187_chk )
This requirement is not applicable for SIPR enclaves.

This requirement is not applicable if the organization subscribes to EEMSG or other similar DOD enterprise protections for email services.

Open the Exchange Management Shell and enter the following command:

Get-SenderFilterConfig | Select-Object -Property Name, Enabled

If the value of "Enabled" is not set to "True", this is a finding.

Note: "Enabled" set to "True" is the default value.
Fix Text (F-63272r942188_fix)
Open the Exchange Management Shell and enter the following command:

Set-SenderFilterConfig -Enabled $true