Submit button in form will not send info to email

Question

I had a friend build a website in Dreamweaver CS5.5. Now that it is live, I can't get the "send" button on the form to send the information to my email.There is a sendmail.php set up. Any help would be much appreciated...Thank you.
The page is http://www.shieldscontracting.com/contact.html
The html is
    <form id="ContactForm" action="sendmail.php" method="post" enctype="multipart/form-data" style="margin-left:350px; margin-top:-20px;">
      <div class="rowi">
                      <p>Name:<br />
                                <input type="text" name="name" class="input required" />
                      </p>
</div>
                            <div class="rowi">
                                E-mail:<br />
                                <input type="text" name="email" class="input required email" />
                            </div>
                            <div class="rowi">
                                Phone:<br />
                                <input type="text" name="phone" class="input required" />
                            </div>
                <div class="rowi">Project Details:<br />
                                <textarea cols="50" name="message" rows="10"></textarea><br />
                  <a href="thankyou.html" class="link" onclick="sendmail.php"><span>Send</span></a></div>
    </form>
The sendmail.php is
<?php
$name = $_REQUEST['name'];
$email = $_REQUEST['email'];
$phone = $_REQUEST['phone'];
$message = $_REQUEST['message'];
  mail( "[email protected]", "Website Contact",
  "Contact From Website
  Name: $name
  Email: $email
  Phone: $phone
  Message: $message", "From: $email" );
   header( "Location: thankyou.html" );
?>

Answer 1

First, the page is down, I just get a generic page.  Second you may need to reach out to your web host.  I see that you are using hosting from Intuit.  Being that they have a proprietary setup, some custom scripts may not work.
Third, once that is confirmed, if you are making this script I would recommend changing the $_REQUEST text in the sendmail to $_POST.  $_REQUEST means that your form can get spammed because they can pass the data via GET or POST.  The $_POST is just the first step to ensure the data came from your form.