Import a MBOX File into Gmail with Thunderbird

Table of contents

Restoring the emails from an export back into Gmail requires the use of 3rd party applications to import an MBox file. We recommend you use the Thunderbird application to transfer the MBox files from your Google account to UMD email. You will be required to export your mail to the Mbox format. For instructions on how to create the MBox file, see Use Google Takeout to Export Data from Google Mail to an MBox File.

NOTE: University personnel are prohibited from transferring, forwarding or sending UMD business email to or from a TERPmail or personal email account. For more information, read IT Standard Institutional Email (IT-14) and UMD Email Frequently Asked Questions (FAQ) in the IT Library.

Setup an email account using Thunderbird

Download, install and configure the Thunderbird mail application. This article works with the version, 10.9.1 (64-bit).


Install ImportExportTools Add-On for Thunderbird

Follow these instructions for installing ImportExportTools NG.


In Thunderbird import the emails from the MBOX file for the label that you want to restore

  1. Click once on Local Folders.
    Illustration for clicking once on Local Folders in Thunderbird
  2. From the menu bar, select Tools>ImportExportTools NG>Import mbox file.
    Select Import mbox file
  3. Choose the import way, click OK.
    Choose the import way and click OK
  4. Select the MBox file.
    Select the Mbox File
  5. The MBox will appear under Thunderbird's local folders.
  6. If you wish to import the mbox into your UMD gmail account, click and drag the folder to your @umd Inbox.
    Mbox will appear under Local Folders         Drag the folder to the Inbox
  7. Once this is completed then you can log in to your Gmail account online and you should see all of the emails restored.