mail message in asp.net

Hi,

Refer to the following link it may help you and sort out your problem.

http://www.c-sharpcorner.com/uploadfile/17e8f6/sending-automatic-mails-in-Asp-Net/
http://www.c-sharpcorner.com/uploadfile/17e8f6/sending-automatic-mail-through-Asp-Net/

code somehow works bt there is some error 
Command not implemented. The server response was: 5.5.1 Unrecognized command. pn9sm29761957pbb.22 - gsmtp 
i dnt knw how to resolve it....