Login to your control panel at Domaincheck Control Panel
In the subscription drop-box at the top of the screen, select your Plesk Domain subscription.
Click on Mail
Click the Create Email Address button
Type the email address you would like and choose a new password to access this mailbox then click Ok
If you would like to use a random password click on the Generate button to create a random password.
Click on the Show button to display the newly generated password.
Click on OK