Exchange must not send delivery reports to remote domains.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-259705	EX19-MB-000230	SV-259705r961620_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 Exchange Management Console (EMC) or the New-RemoteDomain cmdlet.

STIG	Date
Microsoft Exchange 2019 Mailbox Server Security Technical Implementation Guide	2025-05-14

Details

Check Text (C-63444r942427_chk)

Open the Exchange Management Shell and enter the following command:

Get-RemoteDomain | Select-Object -Property Identity, DeliveryReportEnabled

If the value of "DeliveryReportEnabled" is not set to "False", this is a finding.

Fix Text (F-63352r942428_fix)

Open the Exchange Management Shell and enter the following command:

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

Note: The <IdentityName> value must be in quotes.