sending mails without using of SMTP server???

Hi Meganathan, are you writing some emailer program ?
Well you need to keep few things in mind first if you are looking to do this from your college network, than your network/firewall settings may create problems.
Anyway you may wnat to read this article to know more about directsend - http://www.aysoft.com/tips/direct.htm
You can see some softwares which work without SMTP here http://www.sharewareconnection.com/titles/direct-send.htm (have never used them)
Although I think you are looking to do this programatically. It seems there a .Net component Direct send or of similar name which enables you to do this.
Edit - here is one more free software http://www.softpedia.com/get/Internet/E-mail/Mailinglist/Mail-Direct.sht...