To add an email Aliases in the plesk control panel,please follow the following steps :-
1) Login to Plesk Control Panel.

2) Click on "Subscription".

3) Click on "Manage Hosting" in front of the domain whose files permession you want to change.

3) Click on "Mail Tab" and Select the "E-mail address" under which you want to add "Email Aliases".

3) Click on "E-mail Aliases Tab" and "Type Email Alias" name.

6) Click "Ok".
