1. Open Thunderbird, click on "Tools" then "Account Settings".

2. Under your existing email profile, click on "Server Settings".

3. Change "User Name" to your email address (ie, support@radix.net).

4. Click on "Outgoing Server (SMTP)".

5. Change "Server Name" to smtp.radix.net

6. Check "Use Name and Password", then enter your email address under "User Name".

7. You have completed the Email settings.

Click on "OK" to complete the modifications