Exchange must have accepted domains configured.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-69787	EX13-EG-000015	SV-84409r1_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
MS Exchange 2013 Edge Transport Server Security Technical Implementation Guide	2018-09-18

Details

Check Text ( C-70239r1_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 Default value 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.

Check Text ( C-70239r1_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 Default value 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-75999r1_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 quotes.