Quiet bot lookup and filtering in ASP.NET MVC

Question

I am setting up an email form and I need to be able to check bots and filter them silently. The site runs ASP.NET MVC. I would like to avoid CAPTCHA. Any ideas?

Answer 1

IIRF can perform a blacklist based on a user agent or IP address (or other things). Works with ASP.NET, PHP, whatever. Powered by IIS5, 6, 7. Fast, easy, free.

You can view the document here .

Answer 2

, " ", CSS , . - :

<style type='text/css'>
#other_email_label, #other_email {
    display: none;
}
</style>
...
<form action='mail'>
<label id='other_email_label' for='other_email'>Please leave blank:</label>
<input type='text' name='other_email' id='other_email'>
...
</form>

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Answer 3

, JavaScript page_load . , , , /, ( ) ( ctrl-v).

Bots that simply send POST or GET data without loading the page are also filtered.

I don't know the implementation details, but it might be an idea.