Many of these will even use any sort of activation email that you try to send in order to further their goals.
Not only that, but if you leave any kind of vulnerability such as MySQL injection or XSS based exploits, they will eventually discover and begin to use them.
On mine I use a HTTPS post and email activation, and even with input filtration to prevent a SQL injection I still get a bunch of obviously spam signups every day. The only really foolproof way to stop them is to actually talk to the client before accepting their registration, that way you can get a feel for what to expect from them and they know you are paying attention to your equipment.
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Last edited by ttb62; December 8th, 2011 at 23:05. Reason: change a word
WOW the spam bots have gotten really advanced when they know to check the e-mail address and click the link. I guess this is why I see so many of those type the letters from this image tests.
Just a random idea I just came up with:
How about you guys try this to prevent spam bots, "An E-mail Image Captcha", isn't it brilliant ?
So, my idea is, to generate a random code with PHP and use some somewhat distorted font to do it, to prevent OCR and still keep it within the limits of human readability, save that text to MySQL/whatever database you use, and then generate a random, unique file name send the image in an email along with the link to the activation code for that email, which in turn will check against the MySQL data for a match in the codes, tell me what you think.