Deleting an email without a web hosting control panel can be a bit of a pain to do. You need to know exactly where to look and what configuration file to edit. Then you need to be sure you remove all the contents of the email from the server in order to free up the space.
With Plesk 10 (and other control panels as well) removing or deleting an email account and address from your web hosting plan is extremely easy and can be done in under a couple minutes. Whether someone has quit your company and you need to delete their work email, or you are simply reorganizing your email, this video will show you how to delete email addresses quickly and easily.