Sending Email to more than one user at same time

I have created another field with name emailtotext_c.
The code is given below where I have reached :


 if (!defined('sugarEntry') || !sugarEntry) die('Not A Valid Entry Point');
        require_once('data/SugarBean.php');
        require_once('include/SugarPHPMailer.php'); 
        class work_flows{
                function work_flows_execute(&$bean, $event, $arguments)
                {
                      $link = "Support_Cases_emailtotext_c"; 
                if ($bean->load_relationship($link))   
                {           
                $relatedBeans = $bean->$link->getBeans();      
                foreach($relatedBeans as $relatedBean)
                {       
                $contact_id = $relatedBean->id;      
                $contact = BeanFactory::getBean('Contacts', $contact_id);        
                $contact_email = $contact->emailAddress->getPrimaryAddress($contact);    
                $bean->emailtotext_c = $contact_email;     
                }   
                }
                }

I am having confusion what to add in the $link variable. It is only sending email to primary address but not on the field I created.
And What to do next to make it workable ?