You can delete the email account in the control panel Plesk by follow this step:
1. Login to Plesk by typing your website name followed by:8443 or:8440, for example, yourdomain.com:8443, then specify a username, password and click on Log In.
2. On the left menu bar, click on “Mail”.
3. Select the mail account that you want to delete then click on Remove Button.
4. The message box will show to confirm to delete the account. If you want to delete click on the Yes button.
5. The system will show the message informing that the account has been deleted.
