Protecting Your PHP Web App From Disposable Email Users via BDEA api http://w3guy.com/protect-php-app-disposable-email/

deaFilterClient.php

<?php
function checkDEAfilter($email)
{ 
$key = "d619f9ad24052ad785d1edf65bbd33b4"; //replace with your API key
$request = "http://check.block-disposable-email.com/easyapi/json/".$key."/"    .$email;
$response = file_get_contents($request);
$dea = json_decode($response, true);

if ($dea['request_status'] == 'success') {
if ($dea['domain_status'] != "ok") {
  //Access Denied
  return false;
} else {
  // Access Granted
  return true;
}
 } else {
// something else went wrong with the address (maybe a malformed domain)
return "false";
}
}

index.php

<?php include "deaFilterClient.php";?>

<form action="" method="post">
<label for="male">Email Address</label><br/>
<input type="text" name="email" id="email" value="<?php echo (isset($_POST["email"])) ? $_POST["email"] : "";?>"/>
<?php 
// validate and detect if email is disposable or not
if (isset($_REQUEST["email"])) 
            { 
    if ( !checkDEAfilter($_REQUEST["email"])) {?>
     <img src="images/cancel.png"/> &nbsp; &nbsp; <input type="submit" value="validate"/> <?php } 
else echo '<img src="images/accept.png"/>';} else echo '<input type="submit" value="validate"/>';
?>
    <br/><br/>
    <input type="submit" name="submit" value="submit form"/>
    </form>
// validate the form before sent to the server for processing
// Check if email is set and if it not disposable
<?php if((isset($_REQUEST["submit"])) && (checkDEAfilter($_REQUEST["email"]))) {
        echo "your email is " . $_REQUEST['email'] ;
        }
        ?>