controllers/tab/settings/emailTemplates/form/EmailTemplatesForm.inc.php

<?php

// Import the base Form.
import('controllers.tab.settings.form.PressSettingsForm');

class EmailTemplatesForm extends PressSettingsForm {

   function EmailTemplatesForm($wizardMode = false) {
      $settings = array(
         'emailSignature' => 'string',
         'envelopeSender' => 'string'
      );

      $this->addCheck(new FormValidatorEmail($this, 'envelopeSender', 'optional', 'user.profile.form.emailRequired'));

      parent::PressSettingsForm($settings, 'controllers/tab/settings/emailTemplates/form/emailTemplatesForm.tpl', $wizardMode);
   }


   //
   // Implement template methods from Form.
   //
   function fetch(&$request) {
      $params = array('envelopeSenderDisabled' => !Config::getVar('email', 'allow_envelope_sender'));

      return parent::fetch(&$request, $params);
   }
}

?>