void (*request_fetch_images_func) (ModestMsgView *msgview);
gboolean (*has_blocked_external_images_func) (ModestMsgView *msgview);
void (*limit_error) (ModestMsgView *msgview);
+ void (*handle_calendar) (ModestMsgView *msgview, TnyMimePart *calendar_part, GtkContainer *container);
};