Are you trying to access your account from within your college's LAN or are you trying to access it from outside? If you are trying to access it from outside, is this your first time? This is important because many outside ISPs require all mail to be sent through the ISP's SMTP server. Most allow you to receive mail from anywhere. However, you can send mail only through the ISP's SMTP server. Many firms provide a web-based client to allow you to send and receive mail from anywhere.