[Digital Jedi]

Make sure your questions are not math questions or questions that say "type the word [word] in the box" or "are you a human?". Come up with simple, but impossible for bots to guess questions.

You can use HTML with no spam, so I use small images and ask brain dead questions about them. Like "(Fill in the blank) This is a picture of Super___." and then have a picture of Superman, or "What kind of animal is this?" and then have a picture of a dog. Just make sure you don't name the picture anything remotely close to what the answer is.

Also remember that humans can register bots and then send them o'spammin', or bots could have registered months ago and don't start spamming until after you've installed precautions.