I want to call a controller action to send email from my custom module page,

**EX :** my module template is ->refer.phtml
I want to call a smtp module email controller.
Module path is  `HTD/SMTPemail/Smtp/test`

My **TestController.php**

    class HTD_SMTPemail_Smtp_TestController extends Mage_Adminhtml_Controller_Action
    {
    }

**How to call this controller action to send emails from refer.phtml file?**

Both my phtml file and smtp controllers are in two different module.