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Setting Up Modern Authentication for Microsoft 365's SMTP Server

Patrick Wong
  • Updated

    If your organization uses the SMTP server for Microsoft 365 (which includes Office 365), you can configure your On-Premise Maximizer installation to deliver mail using that SMTP server using Modern Authentication. 

    warning.png
    		 The values and email addresses posted in these images are for demonstaration purposes only. Do not use these values in your production environment!

    Configuration starts with your organization's setup within Microsoft Azure. Once logged in, you will need the following three values:

    • Client ID
    • Tenant ID
    • Client Secret

    Here is how to obtain these values.

    In MS Azure

    1. Log in to the Microsoft Azure portal using your organization's administrative account.
    2. Select More Services.
      M365 Modern Auth 01.png
    3. Search for and select App Registrations.
      M365 Modern Auth 02.png
    4. Click New Registration.
      M365 Modern Auth 03.png
    5. Enter an application Name.
    6. Under Supported Account Types, select Accounts in any organizational directory (Any Microsoft Entra ID tenant - Multitenant).
    7. Click Register.
      M365 Modern Auth 04.png
    8. Under Essentials, you will see the Application (client) ID and Directory (tenant) ID.
      Copy these values. you will need them later.
      M365 Modern Auth 05.png
    9. In the left-side panel, expand Manage.
      M365 Modern Auth 06.png
    10. Select Certificates & Secrets.
      M365 Modern Auth 07.png
    11. Click New client secret.
      M365 Modern Auth 08.png
    12. Enter a description into the Description field and select an appropriate expiry time for the Expires drop-down field.
    13. Click Add.
      M365 Modern Auth 09.png

      1. A new client secret will be generated.
        M365 Modern Auth 10.png

        warning.png
        		 Make sure you copy the client secret to a permanent location (eg. a text editor) before refreshing the page. Otherwise, the client secret can no longer be copied.
    14. In the left-side panel, select API Permissions.
    15. Click Add a permission.
      M365 Modern Auth 11.png
    16. Select Microsoft Graph.
      M365 Modern Auth 12.png
    17. Select Application Permissions.
      M365 Modern Auth 13.png
    18. Expand Mail and put a checkmark beside Mail.Send.
      M365 Modern Auth 14.png
    19. Expand User and put a checkmark beside User.Read.All.
      M365 Modern Auth 15.png
    20. Click Add Permissions.
    21. Click Grant admin consent for ....
      M365 Modern Auth 16.png
    22. Click Yes.

     

    In Maximizer

    1. Open a new browser tab and browse to your Web Administration Login page (eg. https://max.yourcomp.com/MaximizerAdmin).
    2. Log in with your Maximizer administrator account (or MASTER).

       
    3. In the left-side panel, select Email Server Settings.
    4. Click Modify Options.
    5. For the Authentication Type, select Office 365 modern authentication.
    6. Paste the client ID, tenant ID and client secret you copied from your Azure setup and paste them into their respective fields.
      M365 Modern Auth 19.png
    7. Click Save.

    Troubleshooting

    Emails not delivering: Emails you send from Maximizer are no longer being delivered to recipients. At the time of configuration, emails were delivering successfully.

    In Step 13, under the "In MS Azure" section, you created the Client Secret. Notice that this value has an expiry date. If this expiry date has passed, you will need to create a new Client Secret value, then paste it into Maximizer (step 6, under the "In Maximizer" section).

     

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