Thanks!
function mandrill($message)
{
$message['subaccount'] = "BilligeFifaCoins.dk";
$message['tracking_domain'] = "email.billigefifacoins.dk";
$message['signing_domain'] = "billigefifacoins.dk";
$message['return_path_domain'] = "bounce.billigefifacoins.dk";
return $message;
}
add_filter('mandrill_payload', 'mandrill');