I have been developing a asp.net application in which i have to mail to large number of user an email.

I used the classes in System.Net . Every thing is fine, there are no errors in the page.

But while sending mail i get an exception:
as follows:
SPAM Score exceeded Threshold

Can anybody tell what is this:
How do i send mail to large number of users using ASP.NET.

Thanks.

You're getting that message from a remote mailserver and there isn't much you can do about it. The mailserver considers the message you are trying to send as likely spam and blocks it. You should wrap your sending message procedure in a try/catch block and continue on despite it failing.