Below are simple instructions to set up your GVI web mail with Microsoft Outlook.
In Microsoft Outlook, select Tools > Accounts.
On the E-mail Accounts wizard window, select properties
On the Server Type window, select POP3 and click Next.
In the User Name and Password fields, type your user name and password, and then specify whether you want Outlook to remember your password.
In the Incoming mail server (POP3) field, type the name of your incoming server mail.mydomain.com, where "mydomain.com" is the name of your domain.
In the Outgoing mail server (SMTP) field, type smtpout.secureserver.net.
Click More Settings.
In the Internet E-mail Setting window, click Outgoing Server.
Select My outgoing server (SMTP) requires authentication.
Select Log on using, and then, in the User Name and Password fields, type the user name and password you set up in the SMTP relay section of your Manage Email Accounts page.
Specify whether Outlook should remember your password.
Click Finish.

