[Tadrill] Exchange Online Content Block Bypass Settings (Microsoft 365)

Overview

This article introduces the Procedure for configuring the Settings for admins deploying Tadrill in integration with Microsoft 365. These Settings ensure that Exchange Online's content blocking feature does not prevent the opening of Training Emails from being detected, so that opens are counted correctly.

Notes

1. The content of this article is based on the product specifications as of July 2026.
   It may be changed without prior notice due to future updates or specification changes.
2. A Tadrill admin Role is required to view the screens and Modify the Settings. 
   For information on how to access the admin panel, please refer to the following article.
   How to Access the HENNGE Tadrill Admin Panel
3. This Procedure modifies the Settings of users that exist when the command is executed. Therefore, it must be performed each time users are added.
   For this reason, we recommend executing the command immediately before conducting Trainings.

Preparation

1. From the Tadrill admin panel, click [Training Emails] in the left menu.

   

2. Click [Submit] in the upper-right corner of the screen.

   

3. Select [Insert phishing URL in the mail body], then click [Proceed].

   

4. From the templates displayed on the left side of the screen, select [For connection Settings: Tadrill Domain / Ip address].

   

5. From the template displayed on the Training Email Submit screen, check the ■Domain (for bulk registration in the Microsoft 365 “Trusted Senders List”) section.
   ※ This command will be used in the Procedure, so keep the window open and Proceed to the next step.

Procedure

1. Connect to Exchange Online PowerShell.
   Connect to Exchange Online PowerShell (external link)
2. Copy and execute the PowerShell command “■Domain (for bulk registration in the Microsoft 365 “Trusted Senders List”)” from the screen opened in step 5 of Preparation.
   ※ If the command fails, follow How to resolve failures of the command in Procedure 2.

3. Enter the following command.

   Get-Mailbox -RecipientTypeDetails UserMailbox -ResultSize Unlimited | Get-MailboxJunkEmailConfiguration | Select Identity,Enabled,TrustedSendersAndDomains

4. Confirm that the Domain listed in the command in step 5 of Preparation is displayed in “TrustedSendersAndDomains” in the output.
   ※ Some values may not be displayed.

How to resolve failures of the command in Procedure 2

For users that cannot be registered using the command in Procedure 2, perform one of the following actions.

1. Execute the command in Procedure 2 for one Domain at a time for each user.

   Set-MailboxJunkEmailConfiguration -Identity "user@example.com" -TrustedSendersAndDomains @{add="example.com"}

2. For each user, configure the Settings in Outlook on the web by following the Procedure below.
   1. Log in to Outlook on the web using a browser.
   2. Click “Settings” in the upper-right corner to open Settings.
   3. From the left menu, open “Training Emails” - “Junk Email.”
   4. Under “Trusted Senders and Domains,” click “＋Add trusted senders.”
   5. Add the Domain to be registered, then click “OK.”
   6. Click “Save” in the lower-right corner.

Translation Disclaimer

This article has been automatically translated from the original Japanese version for your convenience.
While we strive to ensure accuracy, we cannot guarantee its reliability or completeness.

In the event of any discrepancies or questions regarding the content, the official Japanese version shall prevail.