Send mail is an important and common feature in asp.net. using system.net.mail namespace we can send mail. In that article my main concert is to show how shall we send mail asynchronously, as for a bulk of mail sending asynchronous mail send is very important and asp.net have that feature in it.
I had written a wiki in asp.net on with code on send asynchronous mail.
here you will get codes do send asynchronous mail http://wiki.asp.net/page.aspx/536/send-asynchronous-mail-using-aspnet/