Exchange must not send non-delivery reports to remote domains.

From Exchange 2010 Hub Transport Server STIG

Associated with IA controls: ECSC-1

SV-44019r1_rule Exchange must not send non-delivery reports to remote domains.

Vulnerability discussion

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 that non-delivery reports to remote domains are disabled. Before enabling this setting first configure a remote domain using the EMC or the New-RemoteDomain cmdlet.

Check content

Open the Exchange Management Shell and enter the following command: Get-RemoteDomain | select identity, NDREnabled If the value of 'NDREnabled' is not set to 'False', this is a finding.

Fix text

Open the Exchange Management Shell and enter the following command: Set-RemoteDomain -Identity <'RemoteDomainName'> -NDREnabled $false

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