it looks like you will need to add this code to line 1 of the contact.php page:
<?php
// Please specify your Mail Server - Example: mail.yourdomain.com.
ini_set("SMTP","mail.YourDomain.com");
// Please specify an SMTP Number 25 and 8889 are valid SMTP Ports.
ini_set("smtp_port","25");
// Please specify the return address to use
ini_set('sendmail_from', 'ValidEmailAccount@YourDomain.com');
?>