To create an email address, perform the following steps:

1 – Logged in to Plesk.
2 – Go Mail.
3 – Open Email Addresses tab.
4 – Click Create Email Address.
5 – Specify the following mailbox settings:
Email address. Type the left part of the email address before the @ sign, and, if you have several domain names on your account, select the domain name under which the email address will be created.
Access to the Customer Panel. Select this option if you want Plesk to create an additional user for the mail account owner. By default, this user has the role Application user. You can change this role and other user’s settings later.
Password. Set the password for accessing the mailbox.
Mailbox. Turning off this option makes sense only if you want to use this address as a mail forwarder, which will forward all incoming mail to another address.
If you leave the option Mailbox selected, specify the mailbox size or use the default size defined by the provider’s policy or your service plan.
Description in Plesk. You can add additional information about the email address.
6 – Click OK.