Old question, but I thought I’d chime in, as I’ve been maintaining a module for Drupal (Honeypot), which uses the Honeypot spam prevention method alongside a time-based protection (users can’t submit form in less than X seconds, and X increases exponentially with each consecutive failed submission). Using these two methods, I have heard of many, … Read more
Recaptcha has an excellent capture based email protection. You can see it implemented at the bottom of any page in my website using the Site Feedback link.
I actually find that a simple Honey Pot field works well. Most bots fill in every form field they see, hoping to get around required field validators. http://haacked.com/archive/2007/09/11/honeypot-captcha.aspx If you create a text box, hide it in javascript, then verify that the value is blank on the server, this weeds out 99% of robots out … Read more
In my experience the currently most effective methods are honeypot input fields that are made invisible to users via CSS (best use several different methods, such as visibility:hidden, setting a size of 0 pixels, and absolute positioning far outside the browser window); if they’re filled anyway you can assume it’s a spambot. This blog describes … Read more
You must to add a needle headers: Sample code : $headers = “From: myplace@example.com\r\n”; $headers .= “Reply-To: myplace2@example.com\r\n”; $headers .= “Return-Path: myplace@example.com\r\n”; $headers .= “CC: sombodyelse@example.com\r\n”; $headers .= “BCC: hidden@example.com\r\n”; if ( mail($to,$subject,$message,$headers) ) { echo “The email has been sent!”; } else { echo “The email has failed!”; } ?>