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.