Best CAPTCHA with DreamHost Formmail?

Has anyone currently using the DreamHost formmail on their website submission forms implemented a CAPTCHA?

I would appreciate any recommendations and would like to see how its implemented on your form if possible along with a url to download the CAPTCHA and for install instructions would be great!

I’d Recommend:

Works well

You can use this script:
It’s simple but nice working. I’m using this and very pleasure.

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