Configure Modern Authentication on Thunderbird

Please note that you need to be running Thunderbird version 77.0b1 or later which supports OAuth2 modern authentication.

Configure Thunderbird for Office 365

  1. To begin, launch Thunderbird. If you have other accounts configured, click on Local Folders on the left hand side. Select Email under the Setup Another Account section in the main window.
  2. On the Mail Account Setup window, enter the following:
    • Your name: Enter your name
    • Email Address: Enter your OU email address
    • Important: Do not enter in your OUNet password on this login screen. Only enter your OU email address and name.
  3. Now click Continue.
  4. Thunderbird should now automatically discover and enter the needed server settings.
  5. If Thunderbird does not, click the "Configure manually..." button.
    1. For Incoming server:
    2. For Outgoing server:
    3. Outgoing Port: 587 (default)
  6. Click Done to confirm.
  7. If prompted to enter your password, click Cancel.
  8. Click on your Mailbox name in the upper left corner.
  9. Navigate to Account Settings > Server Settings > Security Settings > Authentication Method and select OAuth2 from the Authentication Method drop down.
  10. Click on Outgoing Server in the left pane.
  11. Select the OU mail server and click Edit.
  12. Change the Authentication method to OAuth2 and enter the following:
    1. Description: OU Mail
    2. Server name:
    3. Port: 587 (default)
    4. Connection Security: STARTTLS
    5. Authentication Method: OAuth2
    6. User Name: Your OU Email address
  13. Now click OK.
  14. When you open your Inbox, you should now be redirected to authenticate through Duo.
  15. After authenticating, your mailbox will now load all your mail. Please note this step may take awhile on first configuration.


Additional Configurations

Because Thunderbird has its own configuration methods for mail, you may wish to adjust its options to more closely match how it handles mail if you check your OU mail online or through another client.

  1. Right-click on your OU account and select "Subscribe..." from the drop down menu.
  2. Place a check-mark within the box for the Drafts, Deleted Items, and Sent Items folders.
  3. Click the Subscribe button.
  4. Click the OK button.
  5. Right click on your OU account and select "Settings..." from the drop down menu.
  6. Under your OU account, select "Server Settings".
  7. Select "Move it to this folder:" and set it to the "Deleted Items" folder.
  8. Under your OU account, select "Copies & Folders".
  9. Within 'When sending messages, automatically" option, make sure "Place a copy in:" is checked, select "Other" and select the "Sent Items" folder within your OU account.
  10. Make sure "Drafts" folder is selected within your OU account under 'Drafts and Templates'.
  11. Click the OK button.
  12. Restart Thunderbird

Disable the adaptive junk mail controls

  1. Right click on your OU account in the left-hand pane.
  2. Click on Settings.
  3. Click the Junk Settings option.
  4. Uncheck the box for "Enable adaptive junk mail controls for this account".
  5. Click OK.

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Article ID: 1797
Wed 4/7/21 12:17 PM
Wed 6/16/21 10:50 AM