security - How to block spam mails in inbox using php -


i have coded contact form , process page 1 of client in php

when user submits form mail generated , redirected clients inbox

here im getting terrible hundreds of unknown spam mails @ end of day, don't know generating from,

due our website in danger being added in blacklist on google , other search engines

can please give me solution block spam mails , please find attachment php mail code

below php code

<?php if($_server['request_method'] == "post") { $email = $_post["email"];  $to = "test@myaddress.com";  $cname = htmlentities(ucfirst($_post['name']));  $subject = "subject comes here";  $body= "name : "; $body.= $cname;  $body .= "\ne-mail : "; $body .= htmlentities($_post['email']);  $body.= "\nmessage : "; $body.= htmlentities($_post['message']);      function is_valid_email($email)     {         return preg_match('#^[a-z0-9.!\#$%&\'*+-/=?^_`{|}~]+@([0-9.]+|([^\s]+\.+[a-z]{2,6}))$#si', $email);     }  function contains_bad_str($str_to_test) {   $bad_strings = array(                 "content-type:"                 ,"mime-version:"                 ,"multipart/mixed"         ,"content-transfer-encoding:"                 ,"bcc:"         ,"cc:"         ,"to:"   );    foreach($bad_strings $bad_string) {     if(eregi($bad_string, strtolower($str_to_test))) {       header('location: status.php?status=failed');     }   } }  function contains_newlines($str_to_test) {    if(preg_match("/(%0a|%0d|\\n+|\\r+)/i", $str_to_test) != 0) {     header('location: status.php?status=failed');    } }   if (!is_valid_email($email)) {   header('location: status.php?status=failed'); }  contains_bad_str($email); contains_bad_str($subject); contains_bad_str(body);  contains_newlines($email); contains_newlines($subject);  $headers = "from: $email"; mail($to, $subject, $body, $headers); header('location: status.php?status=success'); } ?>

use captchas prevent spam bots abusing contact form , ensure human beings can use it.


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