How to Remove Duplicate Emails in Apple Mail Efficiently?

Rollins Duke
Published: September 8th, 2025 • 8 Min Read

Are you also an Apple Mail user who uses your mail to send and receive emails? But when users use any mail client for a long time, it is very likely that there will be duplicate emails in the user’s mailbox. Because of this, the user’s mailbox size also increases a lot, and the Apple Mail client also starts working very slowly. Looking at this problem, today we have come up with this article, in which you will know how to remove duplicate emails in Apple Mail account without damaging any accurate emails.

If you are looking for a manual solution to remove duplicate emails in Mac Mail, then we tell you that there is no manual solution to do this process. If yes, there are only a few duplicate emails in your mailbox, then you can delete them one by one. But if you have duplicate emails in bulk, then in that scenario, you will need a professional method. Let’s start the article now and learn how to delete duplicate emails in Apple Mail account.

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Reasons to Remove Duplicate Emails in Apple Mail

Before we understand how to stop duplicate emails in Mac Mail, we need to learn the reasons behind removing duplicate emails in Apple Mail. Here are the following reasons mentioned below:

Duplicate emails take up storage and space in your Mac, which can lead to storage warnings. However, you should remove duplicate emails in Mac Mail.
When you remove duplicate emails in Apple Mail, it improves the performance and the mailbox runs faster.
It simplifies the search results and users get accurate search results.
Removing duplicate emails in Mac Mail helps you to prevent mistakes.
It prevents syncing problems and issues and reduces the server strain.

Manually Remove Duplicate Emails in Apple Mail

Here are the following manual methods to remove duplicate emails in Apple Mail :

Method 1: Remove Duplicate Emails In Mac Mail Using Thunderbird

Download and run Mozilla Thunderbird and set up your Apple Mail Account (IMAP is the best option to use as it syncs directly with the mail server).
Now, in Thunderbird, click the Menu option and select Add-Ons and Themes.
Find “Remove Duplicate Emails”, install it, and restart Mozilla Thunderbird.
Move to the folder from where you want to remove duplicate emails in Apple Mail.
Now, right-click on the folder and select Remove Duplicates.
A dialog will pop up and which will show you all the detected duplicates.
Now, choose the copy you want to keep and click OK to remove duplicate emails in Apple Mail.
Since you used IMAP, the deletions made in Mozilla Thunderbird will show in Apple Mail.
You will see deleted duplicates in Apple Mail.
Now, empty or clean the Thunderbird Trash Folder, and this will automatically reflect in Apple Mail.

Method 2: Removing Duplicates by Sorting and Identifying Duplicate Emails

Open Mail and move to the folder you think has duplicate emails.
From the View menu, sort by date or sort by subject.
Now, manually select and remove duplicate emails in Apple Mail.

Drawbacks of Manual Methods to Remove Duplicate Emails in Apple Mail

The manual methods to remove duplicate emails in Mac Mail are a time-consuming and lengthy process.
These methods are prone to errors, and there is always a risk of data loss if you remove duplicate emails in Apple Mail.
There are chances that the methods can lead to inconsistent results.

Best Method to Remove Duplicate Emails in Mac Mail

There is a professional method to remove duplicate emails in Apple Mail called BitRecover MBOX Duplicate Remover Tool. This software can remove duplicate emails in Mac Mail accounts in bulk, and that too without harming any accurate emails. If you use a manual solution, then you will have to spend a lot of time and effort in deleting duplicate emails one by one but if you use an automatic solution, then you will complete this task in a few minutes. Using this software is as easy as copying a file from one folder to another.

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3 Phases to Remove Duplicate Emails in Apple Mail Account

To remove duplicate emails in Apple Mail account, you have to go through 3 phases. Those 3 phases are Creating an MBOX File Using a Mac Mail Account,Using Apple Mail Email Duplicate Remover and Importing Duplicate Removal Files in Mac Mail.
The step-by-step guidance of these phases is mentioned below:

#1: How to Get MBOX Files from Apple Mail?

If you want to use this software, then you have to first create MBOX files using Apple Mail, which you will upload to the software. Now you must be wondering how it will happen, do not worry, we have mentioned its steps below.

First of all, open an Apple Mail account on your system.
After that, right-click on the folder that you want to export and then select the Export Mailbox option.
Finally, choose the desired location for the resulting file and then press the Choose button.

Note: You now have the MBOX file in your Mac Mail mailbox. Now, let us see how to remove duplicate emails in Apple Mail account.

#2: How to Use Apple Mail Duplicate Email Remover Software?

Firstly, download this Apple Mail Duplicate Email Remover and then install or open this software on your Windows OS.
After that, add the Mac Mail exported files to the Software panel by clicking the Select Folder or Select File option.
Thereafter, check or uncheck the Apple Mail folder as per your requirements.
Choose the destination path for the duplicate removal file.
Finally, select the Duplicate Removal Method as per your choice and then click the Extract button.
Duplicate emails are now deleted from your Mac Mail file. You can see the resultant data on your desired path.

Now you must be wondering how to import this file back to Apple Mail. The process to import the file back to Apple Mail is provided below:

Read Similar: Know How to Reduce Mail Storage on Mac

#3: How to Import the Resultant Mailbox into an Apple Mail Account?

You don’t need to install any other application to import duplicate removal files to your Apple Mail account. It will not take you much time to do this process; you will complete it in a few seconds.

First of all, open the Mac Mail account on your platform, and then click the File button in the menu bar.
After that, select the Import Mailboxes option in the drop-down menu and then choose the Files in MBOX format option.
Thereafter, browse the Duplicate Removal file and then tap the Continue option.

Note: The duplicate emails have now been removed from your Apple Mail account and the duplicate removal file has also been imported into your Mac Mail account. If you want to understand this process in depth, then you can understand by visiting our other article: Export/ Import MBOX into Mac Mail App Mailboxes

Features of the Pro Tool

The tool is considered to be one of the most secure tools to remove duplicate emails in Apple Mail.
It is an expert approved and recommended tool that can delete duplicate MBOX emails within and across the folders.
The tool is a beginner-friendly tool and can delete duplicates from different MBOX files in one go.
The tool preserves the folder hierarchy and automatically generates a log report file.
It also provides a free demo version to users to check the efficiency of the tool.

FAQs

Does deleting emails free up storage?
Yes, deleting emails free up storage but you also have to delete them from the trash in order to truly release the storage.

What is a Duplicate Email?
A duplicate email is an email message which appears more than once in your folder or mailbox.

Is it Safe to Use a Professional Tool to Remove Duplicate Emails in Apple Mail?
Yes, it is safe to use a pro tool like the one mentioned above to remove duplicate emails in Apple Mail.

Conclusion

In this article, we explained to you how to remove duplicate emails in Apple Mail account without losing any attachments and accurate emails. If you want to remove duplicate emails in Mac Mail without any problem, then you have to follow our mentioned process step by step, if you miss any step then you will not get your accurate file. Let’s end this article now, if you are still reading this blog, that means you have liked our solution, then you can download its demo version and take a trial of this software.