Name: Your Name (What ever you want)
Email: Your username
Password: Your columbia.edu account password
Description: columbia.edu
Click Next Button
Hostname: imap.gmail.com
Username: Your username
Password: Your columbia.edu account password
Hostname: smtp.gmail.com
Username: Your username
Password: Your columbia.edu account password
Click Save Button
Use SSL: Yes
Authentication: Password
Server Port: 993
Use SSL: Yes
Authentication: Password
Server Port: 587
You can login columbia.edu and Signup for columbia.edu new account on your iPhone from here.