Follow these steps to configure your account in Eudora.

1. Open Eudora
2. Open Tools menu
3. Click on personalities
4. Right click on left menu [ You can directly reach here just selecting the personality tab in the left menu]
5. Click New…..
6. In wizard check [ skip directly to advanced account setup] then click OK
7. Click FINISH
8. Fill the form and SMTP server will be [mail.domain.ext]
[ Remember: If this SMTP setting doesn’t work then you can use your isp’s smtp ]
9. Uncheck Authentication required
10. Uncheck Use Relay Personality, if defined
11. Click on Incoming Mail
12. Check POP
13. Check Leave mail on server
[ If you want to download all mails then don’t do this ]
14. Authentication style > check Password
15. Click OK

Hopefully this setup works.
If it does not, use your ISP’s SMTP or contact your Network Administrator.