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

Overview

This article provides the procedure for administrators implementing Tadrill in conjunction with Microsoft 365, to configure Exchange Online's content block feature so that the opening of training emails is counted correctly.

Notes

1. The content of this article is based on the product as of July 2026.
   Please note that updates or specification changes may occur without notice.
2. Administrator privileges for Tadrill are required to view the actual screens or make configuration changes.
   For instructions on how to access the Administration, please refer to the following article.
   [Tadrill] How to Access the Administration
3. This procedure modifies the settings of users existing at the time the command is executed, so you must run it each time you add users.
   Therefore, it is recommended to execute the command immediately before conducting the training.

Preparation

1. In the Tadrill Administration, click Training Emails from the left menu.

   

2. Click Create at the top right of the screen.

   

3. Select Insert phishing URL in the mail body and click Proceed.

   

4. From the templates displayed on the left side of the screen, select For Connection Settings: Tadrill Domain / IP Address.

   

5. In the Email Composing screen, check the template item ■Domain (for bulk registration to Microsoft 365 "Safe Senders List").
   * You will use this command in the Procedure section, so please keep this 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 to Microsoft 365 "Safe Senders List") from step 5 in Preparation.
   * If the command fails, please refer to How to handle command failures in Step 2.

3. Enter the following command.

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

4. Check that the domain specified in the command from step 5 in Preparation appears in the TrustedSendersAndDomains field of the output.
   * Please note that not all values may be displayed.

How to handle command failures in Step 2

If you are unable to register users with the command in Step 2, please try one of the following solutions.

1. Execute the command in Step 2 for each user and each domain individually.

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

2. Have each user configure the settings from Outlook on the web using the following steps:
   1. Log in to Outlook on the web using a browser.
   2. Click Settings at the top right to open the settings.
   3. From the left menu, open Mail > Junk Email.
   4. Under Safe senders and domains, click + Add a safe sender.
   5. Add the domain to be registered and click OK.
   6. Click Save at the bottom right.

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.