There are many, many versions of Eudora, but they set up in a similar way.
If your version brings up a wizard, simply follow it along. When you get to POP3 server, it's
mail.turbonet.com
The SMTP server is also
mail.turbonet.com
If you do not get a setup wizard, go to the Tools menu and click Options. Click on Sending Mail. Your outgoing (SMTP) mail server is mail.turbonet.com. At the bottom, where it says Secure Sockets on Sending, check never.
Click on Checking mail. Your POP3 server is mail.turbonet.com. Enter your username and password. Your username does not include @turbonet.com. At the bottom, where it says Secure Sockets ..., check never.
Yes, we do require outgoing authentication (as of April, 2004).