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I have a form on a web site that submits data using jQuery ajax in a JSON format to a sendmail.aspx page, that in an async manner sends an e-mail to corporate mailbox.

I don't want to use captcha. This will make it less comfortable for a user to submit a callback request to my company's service.

I am afraid that someone may use a script to submit a numerous requests to my mailbox via sendmail.aspx.

Which is the simplest way to control of how many sendmail.aspx OnLoads is allowed for one IP? Provide a code snippet or point to a code snippet please.

I have tried using the solution provided here:

http://madskristensen.net/post/Block-DoS-attacks-easily-in-ASPNET.aspx

but it just locks up my user within a second.

Maxim V. Pavlov
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    Did you saw the NoBot control from the AjaxControlToolit? http://www.asp.net/ajaxLibrary/AjaxControlToolkitSampleSite/NoBot/NoBot.aspx – Yuriy Rozhovetskiy Oct 26 '11 at 19:06
  • I've seen the control back in the days when the AjaxControlToolkit was released. I need my client side code to be as clean as possible, so the flood control should take place at a server side by controlling a number of e-mails one IP is allowed to send. – Maxim V. Pavlov Oct 26 '11 at 19:59

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