How to Import Multiple MBOX Files to Yahoo Mail Account?

Published By Jamie Kaler

Approved By Rollins Duke

Published On May 20th, 2025

Reading Time 8 Min Read

Blog Overview: This article will explain the best methods to import MBOX to Yahoo Mail account with all the data from the MBOX file. We will use both manual methods and the safest solution for your help. Choose the best way that suits your needs after reading the complete blog.

MBOX is a very popular email mailbox storage file format that organizes email messages into a text file. All messages are stored in a single file, concatenated sequentially and separated by the keyword “from”. MBOX files were mainly used on UNIX.

These files are used in many email clients and webmail services, including Thunderbird, Apple Mail, Opera Mail, and Eudora. Some email services allow the export of mailbox items as MBOX files, such as Gmail with the help of Google Takeout.

On the other hand, Yahoo Mail is an email service launched in 1997 through Yahoo Inc. Yahoo Mail is the third-largest webmail service in the world. It provides access to maintain data like emails, contacts, calendars, notes, etc., with advanced applications and services.

Yahoo Mail offers the free capacity of 1 TB email storage, a 25 MB email attachment size limit, 100 filters to automatically sort incoming messages, spam and virus protection, etc. However, there are lots of users who want to upload MBOX files to Yahoo Mail accounts.

Why Do Users Want to Import MBOX to Yahoo Mail Accounts?

Here are some basic situations and needs for why users need to perform this process.

It might be that users have an orphaned MBOX file that they want to access, and they have Yahoo Mail as their email service.
Or maybe users want to switch from desktop-based MBOX-supportive email clients like Thunderbird to a web-based service.
Or any users want to keep their MBOX file mails as a backup and safety, and keeping your data online is the best way to have a backup copy.

Why Choose Only Yahoo Mail?

If anyone wants to import MBOX to Yahoo Mail, they will get multiple benefits, like:

They can access emails from any machine and anywhere because Yahoo Mail is a cloud-based email service.
Also, users can manage their professional data with ease and advanced settings like stars, folders, and labels.
This importing MBOX to Yahoo Mail process reduces the risk of data loss due to machine crashes or hardware failures.

How to Import MBOX to Yahoo Mail Manually? For Mac & Windows

Here we use Thunderbird for Windows and Apple Mail for Mac users because these applications support both MBOX and Yahoo Mail accounts. So, read the complete information first and then choose the best method for you.

Method 1: Use Thunderbird Account

Firstly, we will open MBOX file in Thunderbird, and then we will connect the Yahoo Mail account here. After this, you can easily import MBOX to Yahoo Mail account by the moving process. This method is divided into two parts; follow them carefully:

Launch your Thunderbird.
And click on the “ALT” and a “Tools” option will appear, click on it.
A list will appear, select the “ImportExportTools” option, and then the “Import MBOX File” option.
A pop-up will show, and choose the “Import Directly One or More MBOX Files” option.
Browse the destination of your MBOX file and select the “Open” button.

Step 2: Configure Yahoo Mail in Thunderbird

Restart your TB.
Enable the “Tools” menu using the “ALT” key.
And choose “Account Settings” from here.
Find the “Account Actions” and select the “Add Mail Account” option.
Enter the login details of your Yahoo Mail account.
Select the IMAP option and hit the “Done” icon to import MBOX to Yahoo Mail.

After successful account configuration, locate the uploaded data file and right-click on it. Choose the “Move To” option and select the connected Yahoo account.

Finally, log in to your Yahoo Mail account and verify whether your MBOX emails arrived or not.

Method 2: Upload MBOX File to Yahoo Mail for MacOS

Apple Mail is the only email service on a Mac machine that is compatible with the MBOX format and also allows to web-based email service. So, if you have a connected Mail profile, then go for this solution.

Step 1: Move MBOX File to Apple Mail

Open your Mac Mail.
Hit on the “File” >> “Import Mailboxes….” option.
Look for the “Files in MBOX Format” and then the “Continue” button.
Locate your MBOX file to upload, and then click the “Choose” icon.
Wait for the completion process, and then hit the “Done” button.
And you can analyse your MBOX file in Mac Mail.

Step 2: Configure Yahoo Mail in Apple Mail

Restart Apple Mail.
Select the “Mail” >> “Preferences” options.
Hit the “Plus Sign” from the “Accounts” tab.
Provide the email address of Yahoo Mail here.
Next, enter the server details of Yahoo.
Select the “Advanced” tab and provide 993 as your port number.
Next, hit the “Next” icon to save your settings.
And finally, your account connected successfully.

Now you can drag and drop and choose the “Move To” option to import MBOX to Yahoo Mail using your Apple Mail account.

Challenges That Make Manual Approaches Less Reliable

These methods do not allow for importing multiple .mbox files to a Yahoo Mail account in bulk at once.
Users have to follow the same process and steps again and again for each file.
Thunderbird and Apple Mail must be installed on your system with a proper account.
Multiple errors will appear during the configuration of accounts.
Also, these methods contain a high risk of losing data and hierarchy during the process.

Then, Which Solution is Reliable to Import MBOX to Yahoo Mail?

BitRecover MBOX Converter Wizard is the only way to upload MBOX files to Yahoo Mail accounts without losing any information and details. This software helps users and professionals to import data using multiple settings and filters for selective data.

It is compatible with all variations of MBOX files, and also, it can move data directly without following any extra processes and steps.

Any user can convert the mailbox data of multiple users to Yahoo accounts in batches with the help of this application. You can easily install this application on your Windows as well as Mac computers. The function of utility is very simple and can be understood with the help of the following few steps:

Download Now Purchase Now

How to Upload MBOX to Yahoo Mail Account?

Install & run this application on your Windows and Mac PC. Read all the details.
It provides a dual method to load mailbox files: click on “Add Files” or “Add Folders”.
The software previews all the selected MBOX files or folders; re-verify it, and then press “Next”.
Choose the “Yahoo” option from the list of 35+ email and file-saving options.
Also, you can choose the additional options to import MBOX to Yahoo Mail selectively.
Enter your Yahoo Mail account login credentials to set up the MBOX to Yahoo Mail conversion options.
Click on the “Convert” button & analyze the live migration of the whole process in the application panel.
After the conversion process finishes successfully, access the resultant files by logging into your Yahoo Mail account in your browser.

Top Advantages of Import MBOX to Yahoo Tool

This utility offers various advantages and benefits to the users. Some of them are listed below:

The software comes with a complete security package. While the process never stores user credentials inside the interface.
This application allows you to import MBOX to Yahoo Mail, export, and download them from any platform.
The software is capable to import multiple MBOX files in batch to Yahoo Webmail.
The software maintains the integrity of data and retains the metadata properties of source emails.
This utility only requires Yahoo Mail credentials to import MBOX files into Yahoo Mail accounts.
During the process, it preserves all email properties such as attachments, email addresses, internet headers, images, hyperlinks, subject, etc.
The software is completely standalone to perform its work and does not require third-party application installation.

Similarly Read: Import Multiple MBOX Files to Hotmail

Conclusion

In this blog, we discussed various aspects of how a user can import MBOX to Yahoo Mail account instantly. Since there is no free manual method available, we discussed the third-party MBOX to Yahoo Mail migration tool. The best part about this software is that it never fails to maintain the email formatting, like layout, links, signature, etc. It preserves the exact hierarchy of mailbox folders after the conversion process is finished successfully. For more information, contact us via live support chat.