No signature is applied to Internal emails when undeliverable journal reports are sent to an internal mailbox – Knowledge Base

Relevant products: Exclaimer Cloud - Signatures for Office 365

Scenario

Emails sent from an internal user to another internal user do not receive a signature or are not routed to Exclaimer Cloud.

Reason

Undeliverable journal reports are being sent to an internal mailbox and this has the side-effect of causing some unexpected mail routing.

According to Microsoft, "Any mail to JournalingReportNdrTo mailbox will not be journaled and it will not honor transport and mailbox rules settings. It is recommended to create a dedicated mailbox for JournalingReportNdrTo setting or set it to an external address."

Note: For more information, see Transport and mailbox rules in Exchange Online or in on-premises Exchange Server don't work as expected.

Resolution

Note: The steps described below apply even if message journaling is not enabled.

To resolve this issue, you need to specify a dedicated mailbox, as the recipient for Journal Report NDR messages, in Microsoft 365 using the Windows Powershell.

To do this, you need to:

Install the Exchange Online PowerShell module

Connect to Exchange Online

Specify a dedicated mailbox

To complete the steps described below, you will need:
Office 365 Global Administrator credentials

To Install the Exchange Online PowerShell V2 module:

Open the Windows PowerShell and run this command as an Administrator:

Install-Module -Name ExchangeOnlineManagement
Confirm that you want to install this PowerShell module.

Note: For additional installation options, see ExchangeOnlineManagement.

To connect to Exchange Online:

If you have Multi-Factor Authentication enabled, run this command:

Connect-ExchangeOnline -UserPrincipalName <UPN> -ShowProgress $true

In <UPN> enter your username.

If you don't have Multi-Factor Authentication enabled, run this command:

Connect-ExchangeOnline -Credential $UserCredential -ShowProgress $true

When prompted, enter your password (and the Multi-Factor Authentication verification code if required).

To specify a dedicated mailbox:

Run the following command:

set-transportconfig -JournalingReportNdrTo <[email protected]>

<[email protected]> is the email address of the user.

Tip! Microsoft recommends that the JournalingReportNdrTo recipient is set to an external email address or that a dedicated mailbox is created, which has no transport or mailbox rules applied.

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