code: public static <T extends Actor> Props<T> create(Class<T> clazz, ActorCreator<T> creator, MailboxCreator mailboxCreator) {
          return new Props<T>(clazz, null, TYPE_CREATOR, null, creator, mailboxCreator);
      }
docs: Create props from Actor creator with custom mailbox
  
  @param clazz   Actor class
  @param creator Actor creator class
  @param <T>     Actor class
  @return Props object