I added a new domain under Domains and created my website. Then, under the Mail Server tab, I tried to add the same domain so I could set up a webmail server. However, when I try to add the domain under Mail Server, I get a warning saying "this domain has already been added." Yes, I had added it under Domains. But if I don't add it here as well, I can't set up webmail. Should I delete everything and add the mail server first? All I want is to be able to run webmail with an already added domain.