As a Site Administrator, you can remove any of the email
aliases used on your site.
Click the Shortcuts tab on the .
In the shortcuts
area, click Aliases (Email section). The Aliases
form opens, showing the current aliases on the domain.
In the Alias form,
locate the alias you want to remove and in the Actions column,
click
.
In the confirmation
window, click OK.
The alias is removed from the list of aliases.