Step 1: Click the MAIL tab in VestaCP, then click the green “+” to add a mail domain to your control panel.
Step 2: Put in the mail domain that you want to add. Click “Add” to confirm input.
For instructions on adding email accounts, please click this link: http://www.ipserverone.info/control-panel/how-to-addedit-mail-account-to-mail-domain-in-vestacp/