1. Launch Thunderbird. If you are a new user, the Account Wizard should automatically prompt you to help you through configuring your settings. If the Account Wizard does not automatically appear, you can get to it by going up to the "Tools" menu, then selecting "Account Settings...," then clicking on the "Add Account" button.
2. In Mail Account Setup, enter the following:
Name: Your name as it will appear to the recipient
Address: Your full email address in all lower case (ie firstname.lastname@example.org)
Password: Your email address password
Then click "Continue".
3. Next, click "Manual Setup".
4. Next, enter your incoming and outgoing mail servers, server#.domainit.com (the server number varies depending on which server your account is on, and it was emailed to you when you purchased the service. If you do not know what server number you should use, please contact us.). Then click "Create Account". Now you are ready to send and receive email using Thunderbird.
If you get an error that states "connection refused" then your ISP may be blocking the default port number for your outgoing mail server. If your ISP happens to block the default port number (port 25), you can use port 26 as an alternative port number.