You can follow below steps to delete email account in plesk:
- Login to Plesk.
- Click on “Websites & Domains” option and search for domain of which you want to manage email accounts.
- Click on "Email addresses" and you will find all the created email accounts.
- Select the particular email account which you want to remove and click on “Remove” button.
- After that you have to give confirmation for the deletion of email account by clicking on “Yes” option.
- You will get the successful message on top.