Unable to send email from vb.net web application

Am developing a website using vb.net + visula studio 2010 . I am able to send the message from my development labtop by running the application localy. but when I upload to my hosting on godaddy, sending email will fail.

I am using the free email plan from godaddy.

Can some one who faced the same problem let me know what can I do to solve this issue.