PHP Mail / HTML Form Not Sending

Question

I've used this same script before and it works on another form on the same server, but for some reason this time it isn't working and I can't figure out why.

HTML Form:

<form method="post" action="#" class="dealer-form" enctype="multipart/form-data">
<input type="hidden" name="form-type" value="dealer">

    <p><label for="companyname"><span class="required">*</span> Company Name:</label> <input type="text" id="companyname" name="companyname" value="" class="form-control" required /></p>
    <p><label for="name"><span class="required">*</span> Your Name:</label> <input type="text" id="name" name="name" value="" class="form-control" required /></p>
    <p><label for="email"><span class="required">*</span> Email Address:</label> <input type="email"id="email" name="email" value="" class="form-control" required /></p>
    <p><label for="phone"><span class="required">*</span> Phone Number:</label> <input type="tel" id="phone" name="phone" value="" class="form-control" required /></p>
    <p><label for="position"><span class="required">*</span> Your Company Position:</label> <input type="text" id="position" name="position" value="" class="form-control" required /></p>
    <p><label for="street"><span class="required">*</span> Street Address:</label> <input type="text" id="street" name="street" value="" class="form-control" required /></p>
    <p><label for="city"><span class="required">*</span> City:</label> <input type="text" id="city" name="city" value="" class="form-control" required /></p>
    <p><label for="state"><span class="required">*</span> State:</label> <input type="text" id="state" name="state" value="" class="form-control" required /></p>
    <p><label for="zip"><span class="required">*</span> Zip:</label> <input type="text" id="zip" name="zip" value="" class="form-control" required /></p>

    <hr class="new" />

    <p><label for="fedtax">Federal Tax ID#:</label> <input type="text" id="fedtax" name="fedtax" value="" class="form-control" /></p>
    <p><label for="salestax">Sales Tax Permit # (If applicable for your state):</label> <input type="text" id="salestax" name="salestax" value="" class="form-control" /></p>
    <p><label for="license">Security Installer License # (If applicable for your state):</label> <input type="text" id="license" name="license" value="" class="form-control" /></p>

    <h4><span class="required">*</span> Is installing or reselling CCTV or Security Equipment your full time occupation?</h4>
    <p>
    <input name="occupation" value="Yes" type="radio" required />
    <span  class="lbl padding-8">Yes</span>
    </p>

    <p>
    <input name="occupation" value="No" type="radio" required />
    <span  class="lbl padding-8">No</span>
    </p>


    <h4><span class="required">*</span> How long have you been in the business of reselling or installing CCTV?</h4>
    <p>
    <input name="exp" value="Less than 1 year" type="radio" required />
    <span  class="lbl padding-8">Less than 1 Year</span>
    </p>

    <p>
    <input name="exp" value="1 to 5 Years" type="radio" required />
    <span  class="lbl padding-8">1 to 5 Years</span>
    </p>

    <p>
    <input name="exp" value="Over 5 Years" type="radio" required />
    <span  class="lbl padding-8">Over 5 Years</span>
    </p>

    <h4>Security License Certificates, Sales Tax Permits & Resellers Permit:</h4>
    <p><input type="file" id="upload" name="upload[]" multiple></p>

<input type="submit" name="submit" value="Submit Application">
</form>

And here is the php that I've included on the same page as the form:

if( isset($_POST['form-type']) ){

if( $_POST['form-type'] == 'dealer' ){

$to = 'myemail@mydomain.com';

$headers = "From: applications@mydomain.com" . "\r\n";
$headers .= "Reply-To:" . strip_tags($_POST['email']) . "\r\n";
$headers .= "Content-Type: text/html; charset=ISO-8859-1\r\n";


   $companyname = trim(strip_tags($_POST['companyname']));
   $name = trim(strip_tags($_POST['name']));
   $email = trim(strip_tags($_POST['email']));
   $phone = trim(strip_tags($_POST['phone']));
   $position = trim(strip_tags($_POST['position']));
   $street = trim(strip_tags($_POST['street']));
   $city = trim(strip_tags($_POST['city']));
   $state = trim(strip_tags($_POST['state']));
   $zip = trim(strip_tags($_POST['zip']));
   $fedtax = trim(strip_tags($_POST['fedtax']));
   $salestax = trim(strip_tags($_POST['salestax']));
   $license = trim(strip_tags($_POST['license']));
   $occupation = trim(strip_tags($_POST['occupation']));
   $exp = trim(strip_tags($_POST['exp']));

    $body = "<html><body>";
    $body .= "<h3>Contact Information:</h3>";
    $body .= "<p><strong>Name:</strong> $name </p>";
    $body .= "<p><strong>Email:</strong> $email </p>";
    $body .= "<p><strong>Phone Number:</strong> $phone </p>";
    $body .= "<h3>Address:</h3>";
    $body .= "<p> $address <br/>";
    $body .= "$city, $state $zip </p>";

    $body .= "<h3>Company Information:</h3>";
    $body .= "<p><strong>Company Name:</strong> $companyname </p>";
    $body .= "<p><strong>Company Position:</strong> $position </p>";
    $body .= "<p><strong>Federal Tax ID#:</strong> $fedtax </p>";
    $body .= "<p><strong>Sales Tax Permit # (If Applicable):</strong> $sales </p>";
    $body .= "<p><strong>Security Installer License # (If Applicable):</strong> $license </p>";
    $body .= "<p><strong>Is installing or reselling CCTV or Security Equipment your full time occupation?</strong> $occupation </p>";
    $body .= "<p>I have <strong>$exp</strong> experience in the business of reselling or installing CCTV</p>";
    $body .= "</body></html>";

   $subject = "New Dealer Application";

}



mail($to, $subject, $body, $headers);
header('Location:  ' . $this->getUrl('dealers/success'));
exit();

}