How to Move MBOX Emails to Proton Mail? – Top Methods

Bhawna Barwal | Email Conversion email migration file conversion How to's Software Technology | 4 minutes read | Modified on: 12-08-2026
mbox to proton mail

Introduction

Do you ever wonder how to move MBOX emails to Proton Mail? There are two ways available: the manual method and professional software. However, it is highly recommended to opt for a software solution for MBOX to Proton Mail migration. That will make it feasible for bulk conversion, while the manual method is feasible for small numbers of files. This beginner-friendly article explains both methods in detail, so stay here for a while and get the most suitable approach.

MBOX to Proton Mail Converter to Move MBOX Emails to Proton Mail

CubexSoft MBOX Converter is a professional software that helps users transfer MBOX files to Proton Mail through IMAP. It provides a straightforward way to move mailbox data without manually opening and transferring single emails. The software is beneficial for users migrating from email applications that store messages in MBOX format to Proton Mail.  The software allows you to transfer only specific MBOX emails as per user preference. Additionally, the tool can also convert MBOX to PST, PDF, EML, MSG, DOC, CSV, and many more.

One can select files accordingly. The tool does not alter MBOX email details. And MBOX data after the conversion remains the same, without any alteration.  Moreover, the tool’s interface can be interpreted by the user without any technical expertise.  The tool eliminates the need to manually copy individual emails and provides a structured workflow for transferring mailbox data to the Proton Mail environment. Free demo edition of the app allows conversion of 25 MBOX emails to Proton Mail free of cost.  

One of the key benefits of the software is that users can migrate selected mailbox data rather than transferring everything unnecessarily. This makes it possible to move specific folders or complete MBOX mailboxes according to the user’s requirements. The application is also suitable for handling multiple MBOX files when a user has data from several mailboxes or email applications. The app runs on both Windows and Mac Operating Systems.

How to Move MBOX Emails to Proton Mail? – Step-by-Step Instructions

Step1: To move MBOX to Proton Mail, first launch MBOX to IMAP Tool.

Step2: Then add the MBOX files or folders for the migration. Users can select individual folders or choose the complete mailbox according to their migration requirements.

Step3: The software can preview the selected data and display the available mailbox information for review.

Step4: Next, select IMAP as the output option and enter the Proton Mail account details required for the connection.

Step5: Lastly, click on the Convert button to start the migration.

Explore: How to Migrate Thunderbird to Proton Mail on Mac

Move MBOX Emails to Proton Mail Manually

Install Thunderbird

  • Download and install Mozilla Thunderbird on your computer.
  • Open Thunderbird after installation.

Install the MBOX Import Tool

  • In Thunderbird, open >Add-ons and Themes.
  • Search for ImportExportTools NG.
  • Install the add-on and restart Thunderbird.

Import the MBOX File

  • In Thunderbird, right-click Local Folders.
  • Select ImportExportTools NG > Import mbox file.
  • Choose Import directly one or more mbox files.
  • Select your .mbox file.
  • Click Open.
  • Thunderbird will create a folder containing the imported messages.

Verify the Imported Messages

  • Open the newly imported folder.
  • Check several messages to confirm that the sender, recipient, date, body, and attachments are present.

Set Up Proton Mail for Thunderbird

  • Install and configure Proton Mail Bridge.
  • Sign in to your Proton Mail account in Bridge.
  • Keep Proton Mail Bridge running while Thunderbird is open.
  • Thunderbird should then display the Proton Mail mailbox.

Create the Destination Folder

  • In Thunderbird, locate the Proton Mail account.
  • Right-click the appropriate mailbox or folder.
  • Select New Folder.
  • Give it the same name as the folder containing the imported MBOX messages.

Copy the MBOX Messages to Proton Mail

  • Open the imported MBOX folder under Local Folders.
  • Select the messages you want to transfer.
  • Right-click the selection and choose “Copy To” or “Move To”.
  • Select the corresponding folder under your Proton Mail account.
  • For large MBOX files, transfer the messages in smaller batches.

Wait for Synchronization

  • Leave Thunderbird and Proton Mail Bridge running.
  • Wait until Thunderbird finishes uploading the messages.
  • Do not close Thunderbird or shut down the computer during the upload.

Verify in Proton Mail

  • Sign in to Proton Mail through its web interface.
  • Open the destination folder.
  • Confirm that the imported messages and attachments are available.
Repeat for Other MBOX Files
  • Import each additional MBOX file into Thunderbird.
  • Create the corresponding Proton Mail folder.
  • Copy the messages into that folder.
  • Wait for synchronization after each batch.

Note: Manual method may seem complicated for user who have no such technical background.  Also, it Is quite time taking. If you have bulk MBOX data to convert into Proton Mail, then it is highly recommended to opt for top-notch professional MBOX to Proton Mail Migration Tool, free version of this app is also available.

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Wrap Up

The above blog states how to move MBOX emails to Proton Mail by both methods automated as well as manually. And we can simply conclude that how difficult and time taking takes manual method is. If you have a large mailbox and want to automate the process, then MBOX to Proton Mail Tool can be practical option. The tool simple migrates MBOX files to Proton Mail via IMAP.  This software solution is much simpler than long and hectic manual method. Users can simply move batch MBOX data to Proton Mail without any hassle. This software is available on both Windows and Mac Operating Systems. Users can also opt for the free demo facility that enables them to migrate 25 emails from MBOX to Proton Mail completely free of cost.