Email, Messaging, & Video Calls Email How to Edit Received Emails in macOS Mail Clean up emails people send you by editing them yourself By Heinz Tschabitscher Writer A former freelance contributor who has reviewed hundreds of email programs and services since 1997. our editorial process Heinz Tschabitscher Updated January 20, 2020 Carmen Martinez Banus / Getty Images Email Yahoo! Mail Gmail Tweet Share Email Editing messages you've already received might seem unnecessary, but there are probably times when you need to add a subject to an email that doesn't have one or fix broken URLs or bad spelling mistakes. Instructions in this article apply to Mac OS X Tiger (10.4) and later. How to Edit Received Emails in macOS Mail Fortunately, while this isn't a one-click process, it is straightforward. You'll copy the email you want to edit, make the changes in a text editor, import the new version back into Mail, and delete the original. Drag and drop the message out of Mail and onto the Desktop (or any folder). Right-click the EML file you just made and go to Open With > TextEdit. If you don't see that option, go to Open With > Other... to open the Choose an application to open the document <name> window. Pick TextEdit from the list and hit Open. With the message now open in TextEdit, you're free to make any changes you want. Since it might be hard to sift through the text file to find the subject and body, use the Edit > Find > Find... menu in TextEdit to search the whole document. Look for content-type to find where the subject, body, "To" address, and more are stored. Go to File > Save to save the changes to the email file, and then close down TextEdit. The keyboard shortcut is Command+S. Right-click the file on your desktop again and select Mail from the Open With menu. Select Copy to under the Messages menu and select the same location you originally dragged the email from. Close the message window and confirm that the edited message appears in Mail. The changes you made may not appear in the preview window, but they will show up if you open the message. It's now safe to delete the copy you made on the Desktop.