Change the from email address to the person sending the mail
Line 184 of phpcode.php change this:
$headers = 'From: '.($website_name ? $website_name : $parts['host']).' <'.$email_address.'>' . "\r\n";
$headers = 'From: '.preg_replace('#\r|\n#','',$_REQUEST['your_name']).' <'.preg_replace('#\r|\n#','',$_REQUEST['your_email']).'>' . "\r\n";
note: this will most likely cause all “send to friend” emails to be received as spam. because you are sending an email from another persons email address which isn’t linked to your hosting account.