Name: Your Name (What ever you want)
Email: Your username
Password: Your mindspring.com account password
Description: Earthlink
Click Next Button
Hostname: imap.mindspring.com
Username: Your username
Password: Your mindspring.com account password
Hostname: smtpauth.earthlink.net
Username: Your email address is your username
Password: Your mindspring.com account password
Click Save Button
Use SSL: None
Authentication: Password
Server Port: 143
Use SSL: None
Authentication: Password
Server Port: 587
You can login mindspring.com and Signup for mindspring.com new account on your iPhone from here.