i have a contactus.html page and every day i keep receiving a message from someone saying "we can increase your website's rankings.." I dont want to install captcha because that would require me to change contactus.html to contactus.php , which wouldnt be a problem as long as 301 redirect, except that i have to find/replace contactus.html to contactus.php on hundreds of pages. I have tried introducing a math question (what is 3+1) but I am still receiving these messages. what can i do to stop receiving them? what are they using to do this? scrapebox cannot solve these math questions, can it?