Best anti spam methods

[eluser]Christophe28[/eluser]
Hello,

I created a 'register' page using codeigniter. I have used a captcha (plugin), but now I'm not sure this is good enough.

Sometimes I see anti-spam methods like '9 + 1 = '. Does this work? Seems like a pretty easy thing to find for the spambots?

Can somebody suggest the best anti spam methods?

Christophe

[eluser]mdvaldosta[/eluser]
Using a question/answer is the best way currently. Realtime spam blacklists help a lot as well.

[eluser]pickupman[/eluser]
I just finished code for a library using the API from stopforumspam.com. If interested, I just posted it on [url="https://bitbucket.org/pickupman/codeigniter-stopforumspam"]bitbucket[/url]. Allows you to pass a email address/ip address to check if it is blacklisted.

Code:

$this->load->library('stopforumspam_lib');
if($this->stopforumspam->run('[email protected]') == FALSE){
  //Not a spammer
}

That along with a real question is very helpful.

[eluser]jentree[/eluser]
A quick way I use sometimes is create a hidden input that I require to be empty. When I am processing the form, I check if that input is empty. If it is, process the form. If it isn't chances are it might be spam. There is no way a "normal" user can populate the input.

[eluser]Christophe28[/eluser]
Thanks for the info!

@Pickupman: I cannot download it on bitbucket. I signed in, but get the following error:

Error
You do not have access to this repository.

Can you perhaps give me a direct link please?

Thanks!

Christophe