: Random (but coherent) text posted from random IP addresses - what kind of attack is that? My website has a nice by-design anti spam protection. Originaly it was a mistake. What I did is, that

My website has a nice by-design anti spam protection. Originaly it was a mistake. What I did is, that every AJAX-submitted <form> has method="get" but AJAX actually uses POST.

Thanks to this, every spam so far has been dumped in invalid_requests.log. Today, 7 fake emails passed suddenly. Further more, they do not contain malicious links or Viagra advertisement. Just completely irrelevant messages:

From 124.88.67.6 at 12:49:24

Hello. Adopting a child with special needs has been on our hreats and in searching, I came across this site. I went and looked at the Rainbow website and was so touched. A little girl named Beatrice tugged at my heart in a way I never felt and little Ashlyn. Although we can afford to have them, I had no idea it would cost so much to adopt a special needs child. I am feeling torn as there is no way we could but I feel as though God has led us to. Any advice?

If you google that message you'll notice that the word hearts is intentionally malformed randomly to make sure simple comparison doesn't identify two of these messages as same.

From 135.19.194.184 at 9:11:47

Good luck Elle!! These kinds of diets are always eelmxrety risky, so be careful. The minute you start eating carbs again you're risking gaining all that weight right back. My best advice for you, from my experience, is moderation. Look up portion sizes online & make sure you're eating the right foods with the right complimentary foods. You should be eating foods long-term that are a lifestyle change, not just a one week thing, just because your body is going to get used to eating in a new way and then get really upset when you re-incorporate that food you stopped eating! But in any case, good luck & I hope it works for you The toughest thing for me to kick is chocolate, for SURE. I've tried, but I always somehow managed to eat a little bit haha. For shame!!

This second message doesn't appear anywhere on the internet. But again, one word extremely is malformed.

My question is: Do you have any experience with this kind of attack? Why is every IP different? What's the point of these messages? Are there some algorithms that could allow me to filter or at least raise a warning flag on these posts?