Step 1. Open the Mail app.

Step 2. Click on Mail from the top menu.

Step 3. Now, click on Preferences.

Mail Preferences on Mac

Step 4. On the sidebar/left-pane click on the email account you want to remove.

Step 5. Now, click on the “-” from the bottom.

Click on Email Account You Want to Remove from Mac Mail App

Step 6. Confirm the deletion by clicking on OK.