Yes true but mainly for a reason.
Thanks to the world of a few major big parties and the fact that senders of email is faked easily and a lot spammers and phishers forwarding email is almost impossible unless it on the same domain / server. And Experia has there spf records probably set up.
https://help.directadmin.com/item.php?id=471
And so on…
Option might be setting up:
If you have solved the issue feel free to submit a pull request but I think it will be hard to solve.