Add Shared Mailbox to Thunderbird

This article provides the steps and information needed to help users add a shared mailbox to Mozilla Thunderbird.

Procedure

• Open Thunderbird.
• Click the Menu icon > Account Settings.
  • A new tab will open.

• Towards the bottom left, select Account Actions > Add Mail Account....

• Enter the following in the “Set Up Your Existing Email Address” window:
  • Your Full Name: Use the exact name of the shared mailbox
    • Name will be displayed in your Thunderbird folders.
  • Email Address: Email Address of the Shared Mailbox
    • Complete email address with NetID@utdallas.edu
  • Password: Leave blank
  • Remember Password: Uncheck

• Click Configure Manually.

• In the "Manual configuration" enter the following information into the available fields as shown below:
  • INCOMING SERVER
    • Protocol: IMAP 
    • Hostname: outlook.office365.com
    • Port: 993
    • Connection security: SSL/TLS 
    • Authentication: Normal Password 
    • Username: Shared Email Address
  • OUTGOING SERVER
    • Server: smtp.office365.com
    • Port: 587
    • SSL: STARTTLS
    • Authentication: Normal Password 
    • Username: Shared Email Address
• Click Re-test.

• Server settings are confirmed when the green message “The following settings were found by probing the given server:” appears at the top of the window.

• Select Done.
• If it asks you to sign into the Shared Mailbox with a Password, click Cancel.

• Go to Account Settings > Mailbox Column > Shared Mailbox > Server Settings.

• Change “Authentication Method:” to OAuth2.

• Click on Mailbox Column > Outgoing Server (SMPT).
• Select the Shared Mailbox from list and click Edit....

• Change “Authentication Method:” to OAuth2 and set “Connection Security:” to STARTTLS.
• Click OK to save.

• Restart Thunderbird.
  • You will be asked to sign in with the Shared Mailbox’s UTD Password. 
• When prompted to sign in, click Sign-in with another account located below the password text box.

• Log in with your NetID@utdallas.edu and password.
• Authenticate with Duo.
• Select Shared Mailbox’s Inbox and Thunderbird will start to load emails.