added support for entity metadata module

email.module

@@ -12,6 +12,7 @@ function email_field_info() {
       'description' => t('This field stores and renderes email addresses.'),
       'default_widget' => 'text_textfield',
       'default_formatter' => 'default',
+      'property_type' => 'text',
     ),
   );
 }