If your Apple Mail client contains duplicate email messages, you can download and install a Mail add-on that automates the process of identifying the duplicates. When you run the script, duplicate messages are identified and copied to a folder on your desktop. You can then review the messages and delete one of the duplicate copies. Run the script on one mailbox folder at a time in the Mail client to quickly clean up duplicate emails.

Step 1

Download the Mail Scripts archive and save the file to your hard drive (see Resources).

Step 2

Click on the archive to open the file.

Step 3

Press the “Option” key to open the Finder menu, and then click the “Go” option. Click “Library.”

Step 4

Browse to the Scripts folder, and then drag and drop the Mail Scripts script to the folder.

Step 5

Open Apple Mail, and then click on the mailbox you want to check for duplicates. Select all messages in the mailbox.

Step 6

Click the “AppleScript” option, and then click the “Remove Duplicate Messages” option. The script runs and creates a Remove Duplicate Messages folder on the desktop with a Removed Duplicates subfolder. Duplicate messages are removed from the mailbox and copied to the Removed Duplicates folder. When the script is finished running, a notification with the total number of duplicates is displayed.

Step 7

Review the messages in the Removed Duplicates folder to ensure the emails are indeed duplicates, and then delete the duplicate messages.

Step 8

Repeat the process for each mailbox folder.