Mac Mail (OS 10.3 Panther-10.4 Tiger)

Open the Mail Program.
Click on Mail and select Preferences.
Click the Accounts icon.
Select your email account from the Accounts pane on the left. Your Account Information should appear on the right.
At the bottom of the Account Information page, under the Outgoing Mail Server (SMTP) field, click the button labeled Server Settings....
On the Outgoing Mail Server screen, enter smtp.gvtc.com for the Outgoing Mail Server. There will be a field labeled Authentication with a drop-down field to the right. Select Password from the options in the drop-down field.
In the User Name field, type your email username and put your email password in the Password field.
Click OK.
Close the Preferences window to return to Apple Mail and you're done!