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Auto-forwarding email to remote domains must be disabled.


Overview

Finding ID Version Rule ID IA Controls Severity
V-33576 Exch-2-736 SV-43996r1_rule ECSC-1 Medium
Description
Attackers can use automated messages to determine whether a user account is active, in the office, traveling, and so on. An attacker might use this information to conduct future attacks. Ensure Automatic Forwards to remote domains are disabled. Before enabling this setting first configure a remote domain.
STIG Date
Exchange 2010 Hub Transport Server STIG 2013-09-30

Details

Check Text ( C-41682r3_chk )
Open the Exchange Management Shell and enter the following command:

Get-RemoteDomain | select identity, AutoForwardEnabled

If the value of 'AutoForwardEnabled' is not set to 'False', this is a finding.
Fix Text (F-37467r1_fix)
Open the Exchange Management Shell and enter the following command:

Set-RemoteDomain -Identity <'RemoteDomainName'> -AutoForwardEnabled $false