how to stop spam

Hi all,

We have many forms on our site that users can fill out and ask questions,
request information etc. but somehow, we receive a lot of junk mails (more
than two hundreds) within two weeks through these forms.
I don't know hot to stop these junk emails.
Can you provide some ideas and ways to implement?
thank you so much.
--
Betty

Re: how to stop spam

"c676228" wrote in message
news:59E39707-C884-48E4-B51D-0238253BA494@microsoft.com...
> Hi all,
>
> We have many forms on our site that users can fill out and ask questions,
> request information etc. but somehow, we receive a lot of junk mails (more
> than two hundreds) within two weeks through these forms.
> I don't know hot to stop these junk emails.
> Can you provide some ideas and ways to implement?
> thank you so much.
> --
> Betty

You can use Captcha (Google ASP -NET Captcha), or a simpler method that
works on one of my sites is to randomly generate 2 digits, then save the sum
of the digits in a session variable, then provide a form input for users to
enter the sum. Compare the entry to the session variable, and if they are
the same, process the entry.

--
Mike Brind
Microsoft MVP - ASP/ASP.NET

RE: how to stop spam

Hi Betty,

As Mike has suggested, the popular means to prevent spam(machine generated
post ) is through some image based validation(the captcha as Mike mentioned)

http://recaptcha.net/captcha.html

in classic ASP pages, you may need to write a COM component(via VB ) which
can programmtically generate some image(that display some digits) and let
the user input those digits as validation code. The server-side can compare
the validation code with the server cache(in session) to ensure the request
is post by human interactively rather than machine generated code.

Here are some reference about such validation in classic ASP:

http://www.u229.no/stuff/Captcha/

http://www.rodsdot.com/ee/dynamicImage.asp

http://www.tipstricks.org/

Sincerely,

Steven Cheng

Microsoft MSDN Online Support Lead


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--------------------
>Thread-Topic: how to stop spam
>thread-index: AcikOlQ2wMX/x+zdRfmMC5Huq98utg==
>X-WBNR-Posting-Host: 64.85.224.157
>From: =?Utf-8?B?YzY3NjIyOA==?=
>Subject: how to stop spam
>Date: Mon, 21 Apr 2008 22:33:00 -0700

>
>Hi all,
>
>We have many forms on our site that users can fill out and ask questions,
>request information etc. but somehow, we receive a lot of junk mails (more
>than two hundreds) within two weeks through these forms.
>I don't know hot to stop these junk emails.
>Can you provide some ideas and ways to implement?
>thank you so much.
>--
>Betty
>

Re: how to stop spam

>> We have many forms on our site that users can fill out and ask questions,
>> request information etc. but somehow, we receive a lot of junk mails
>> (more
>> than two hundreds) within two weeks through these forms.
>> I don't know hot to stop these junk emails.
>> Can you provide some ideas and ways to implement?
>> thank you so much.
>> --
>> Betty
>
> You can use Captcha (Google ASP -NET Captcha), or a simpler method that
> works on one of my sites is to randomly generate 2 digits, then save the
> sum of the digits in a session variable, then provide a form input for
> users to enter the sum. Compare the entry to the session variable, and if
> they are the same, process the entry.



Here's an easier way: Give them a word and tell them to type it in the box.
"Enter the word HELLO in this box."
If the box doesn't have HELLO or hello, response.redirect right back to the
form.

This method has stopped 100% of the form spam from all my sites.

Re: how to stop spam

"Steven Cheng [MSFT]" wrote in message
news:FwEL2mFpIHA.6028@TK2MSFTNGHUB02.phx.gbl...
> Hi Betty,
>
> As Mike has suggested, the popular means to prevent spam(machine generated
> post ) is through some image based validation(the captcha as Mike
mentioned)
>
> http://recaptcha.net/captcha.html

[snip]

Maybe not...

Gone in 60 seconds: Spambot cracks Live Hotmail CAPTCHA
http://arstechnica.com/news.ars/post/20080415-gone-in-60-sec onds-spambot-cra
cks-livehotmail-captcha.html