mailing-list.php

<?php
if(isset($_POST['email'])) {

    $email_to = "newsletter@developers.ms";
    $email_subject = "Add to newsletter list";

    function died($error) {
        echo "We are very sorry, but there were error(s) found with the form you submitted. ";
        echo "These errors appear below.<br /><br />";
        echo $error."<br /><br />";
        echo "Please go back and fix these errors.<br /><br />";
        die();
    }

    // validation expected data exists
    if (!isset($_POST['email'])) {
        died('We are sorry, but there appears to be a problem with the form you submitted.');
    }

    $email_from = $_POST['email']; // required

    $error_message = "";
    $email_exp = '/^[A-Za-z0-9._%-]+@[A-Za-z0-9.-]+\.[A-Za-z]{2,4}$/';
  if(!preg_match($email_exp,$email_from)) {
    $error_message .= 'The Email Address you entered does not appear to be valid.<br />';
  }
    $string_exp = "/^[A-Za-z .'-]+$/";
  
  if(strlen($error_message) > 0) {
    died($error_message);
  }
    $email_message = "Form details below.\n\n";

    function clean_string($string) {
      $bad = array("content-type","bcc:","to:","cc:","href");
      return str_replace($bad,"",$string);
    }

    $email_message .= "Add To Mailing List."."\n";    
    $email_message .= "Email: ".clean_string($email_from)."\n";


  // create email headers
  $headers = 'From: newsletter@developers.ms'."\r\n".
  'Reply-To: '.$email_from."\r\n" .
  'X-Mailer: PHP/' . phpversion();
  @mail($email_to, $email_subject, $email_message, $headers);
  ?>

<!-- include your own success html here -->

<?php
}
?>