Why contact form gives blank white screen when online? - php

Question

I'm trying to make php contact form work on webhost we are currently using. I found with google this trick to get it work when smtp is off:
http://www.top-answers.net/webhost/web-hosting.html
What I found it only gives me white screen on browser when I upload it to server but as offline it shows the form correctly.
Is there way to make this work or should I seek for another solution?
Thank you
<?php
function has_header_injection($str) {
return preg_match( "/[\r\n]/", $str );
}
if (isset ($_POST['contact_submit'])) {
$name = trim($_POST['name']);
$company = trim($_POST['company']);
$email = trim($_POST['email']);
$phone = trim($_POST['phone']);
$msg = $_POST['message'];
if (has_header_injection($name) || has_header_injection($company) ||has_header_injection($email) ||has_header_injection($phone)) {
die();
}
if ( !$name || !$company || !$email || !$phone || !$msg ) {
echo '<h4 class="error">Kaikki kentät ovat pakollisia.</h4>Palaa takaisin ja yritä uudelleen';
exit;
}
$to = "info#mydomain.com";
$subject = "$name lähetti viestin lomakkeen kautta";
$message = "Nimi: $name\r\n";
$message .= "Yritys: $company\r\n";
$message .= "Sähköposti: $email\r\n";
$message .= "Puhelin: $phone\r\n";
$message .= "Viesti:\r\n$msg";
if (isset($_POST['subscribe']) && $_POST['subscribe'] == 'Subscribe') {
$message .= "\r\n\r\n$name tilasi uutiskirjeen. Muista lisätä sähköpostilistalle!\r\n";
}
$message = wordwrap($message, 72);
require_once "Mail.php";
$from = "info#mydomain.com"; \\the mail-iD under your domain
$to = "myemail#myemail.com"; \\the TO gmail ID
$subject = "PHP Enquiry form";
$body = $email_message;
$host = "mail.mydomain.com"; \\ your domain mail server
$username = "info#mydomain.com"; \\the mail-id under your domain
$password = "secretsecurepassword"; \\your password for yourid#mydomain.com
$headers = array ('From' => $from, 'To' => $to, 'Reply-To'=> $email_from, 'Subject' => $subject);
$smtp = Mail::factory('smtp', array ('host' => $host, 'auth' => true, 'username' => $username, 'password' => $password));
$mail = $smtp->send($to, $headers, $body);
?>
<h5>Kiitos yhteydenotosta!</h5>
<p>Vastaamme kahden arkipäivän kuluessa.</p>
<?php } else { ?>
<form method="post" action="" id="contact">
<label for="name">Nimi</label>
<input type="text" id="name" name="name">
<label for="company">Yritys</label>
<input type="text" id="company" name="company">
<label for="email">Sähköposti</label>
<input type="email" id="email" name="email">
<label for="phone">Puhelin</label>
<input type="text" id="phone" name="phone">
<label for="message">Viesti</label>
<textarea id="message" name="message"></textarea>
<input type="checkbox" id="subscribe" name="subscribe" value="Subscribe">
<label for="subscribe">Tilaa uutiskirje</label>
<button type="submit" class="button next" name="contact_submit">Lähetä</button>
</form>
<?php } ?>