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Exchange must have accepted domains configured.


Overview

Finding ID Version Rule ID IA Controls Severity
V-221204 EX16-ED-000030 SV-221204r612603_rule Medium
Description
Exchange may be configured to accept email for multiple domain names. This setting identifies the domains for which the server will accept mail. This check verifies the email server is not accepting email for unauthorized domains.
STIG Date
Microsoft Exchange 2016 Edge Transport Server Security Technical Implementation Guide 2020-12-10

Details

Check Text ( C-22919r411738_chk )
Review the Email Domain Security Plan (EDSP).

Determine the Accepted Domain values.

Open the Exchange Management Shell and enter the following command:

Get-AcceptedDomain | Select Name, DomainName, Identity, Default

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

or

If the "Default" value for "AcceptedDomains" is set to another value other than "True" and has signoff and risk acceptance in the EDSP, this is not a finding.
Fix Text (F-22908r411739_fix)
Update the EDSP.

Open the Exchange Management Shell and enter the following command:

Set-AcceptedDomain -Identity <'IdentityName'> -MakeDefault $true

Note: The value must be in single quotes.