Spam filter for ASP.NET?
<p>I'm looking for a spam filter that I can integrate into my ASP.NET application. I don't want any delegate services (e.g. Akismet) as I'm doing this for a high traffic website, any suggestions?</p>

<p>Edit:
I mean a post spam filter, it's a forum based website.</p>

<p>Edit:
Thanks for your answer but I'm not looking for a Captcha, I'm looking for a spam filter, Captcha is not a spam filter it's used for preventing automated spam but it's not a spam filter itself, a spam filter is a piece of software that scans the posts and mark them as spam or not. Actually I already have a Captcha in my application for preventing automated spam.</p>
