Email über Brother-Scanner versenden Fehler: 550 5.7.1 No From header found in the message

This is the mail system at host mout-p-101.mailbox.org.

I'm sorry to have to inform you that your message could not
be delivered to one or more recipients. It's attached below.

For further assistance, please send mail to postmaster.

If you do so, please include this problem report. You can
delete your own text from the attached returned message.

                   The mail system

<xy@jimdo.com>: host mx1.jimdo.com[173.203.187.1] said: 550 5.7.1
    No From header found in the message cf RFC5322 3.6  (G24) (in reply to end
    of DATA command)


Reporting-MTA: dns; mout-p-101.mailbox.org
X-Postfix-Queue-ID: 4SwMLL6Wxxz9stc
X-Postfix-Sender: rfc822; xy@mailbox.org
Arrival-Date: Wed, 20 Dec 2023 19:20:26 +0100 (CET)

Final-Recipient: rfc822; xy@jimdo.com
Original-Recipient: rfc822;xy@jimdo.com
Action: failed
Status: 5.7.1
Remote-MTA: dns; mx1.jimdo.com
Diagnostic-Code: smtp; 550 5.7.1 No From header found in the message cf RFC5322
    3.6  (G24)


Return-Path: <xy@mailbox.org>
Received: from smtp202.mailbox.org (smtp202.mailbox.org [10.196.197.202])
	(using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)
	 key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256)
	(No client certificate requested)
	by mout-p-101.mailbox.org (Postfix) with ESMTPS id 4SwMLL6Wxxz9stc
	for <xy@jimdo.com>; Wed, 20 Dec 2023 19:20:26 +0100 (CET)
Content-Type: multipart/mixed; boundary=------------------------76c2ae8108727dfd
Mime-Version: 1.0
To: xy@jimdo.com
Date: Wed, 20 Dec 2023 19:19:48 +0100
Subject: Scan to E-mail Server Job
X-MBO-RS-ID: c6fa7d8b0a895cc6ee4
X-MBO-RS-META: xoe151uhhuckyhp3f35wm3bs5qyzb8bj

ich habe einen neuen Brother ads-1700w bei mir im Einsatz.

Laut Webinterface auf dem Brother ist das Sender-Postfach (mailbox.org) korrekt eingerichtet (Habe es auch bei anderen Diensten erfolgreich identisch am laufen)

Leider wird die Email von der Empfängeradresse (Jimdo) abgewiesen.

Folgenden Fehlertext erhalte ich (E-Mail-Adressen unkenntlich gemacht):

Was kann ich hier machen, damit der Empfang klappt?