You Recieve a plesk server default page when going to webmail.[domain].com

Webmail is not setup to run as your email provide in the Plesk Control Panel

1. Under System in your Control Panel click the domain name you need.
2. Click the Mail icon.
3. Click Preferences.
4. Choose the required WebMail client software in the WebMail menu to enable the ability to read mail through a browser-based WebMail application for users of mailboxes in this domain.
5. Click OK.