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Exchange must not send delivery reports to remote domains.


Overview

Finding ID Version Rule ID IA Controls Severity
V-69925 EX13-EG-000325 SV-84547r1_rule 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 that delivery reports to remote domains are disabled. Before enabling this setting, first configure a remote domain using the EMC or the New-RemoteDomain cmdlet.
STIG Date
MS Exchange 2013 Edge Transport Server Security Technical Implementation Guide 2017-01-04

Details

Check Text ( C-70395r1_chk )
Open the Exchange Management Shell and enter the following command:

Get-RemoteDomain | Select Name, Identity, DeliveryReportEnabled

If the value of DeliveryReportEnabled is not set to False, this is a finding.
Fix Text (F-76157r1_fix)
Open the Exchange Management Shell and enter the following command:

Set-RemoteDomain -Identity <'IdentityName'> -DeliveryReportEnabled $false

Note: The value must be in quotes.