The e-mail address is on a very official looking "invitation to pay" from Deutsche Post DHL Group in Frankfurt am Main with no other phone number or whatsoever.
NO WAY I will create an email account with de-mail just to be able to send DHL Group a complaint, but an official complaint to the Bürgerbeauftragter will be sent out shortly.
Geman Digitalization in all its messy glory...
This is the response you get when you try to email the address mentioned:
I'm sorry to have to inform you that your message could not be delivered to one or more recipients. It's attached below. <poststelle.hza-ffm@zoll.de-mail.de> failed: host mx.de-mail-t-systems.de-mail.de (83.125.35.23) said: 554 5.7.1 <poststelle.hza-ffm@zoll.de-mail.de>: Recipient address rejected: Ihre E-Mail wurde abgewiesen, da es sich bei De-Mail um einen geschlossenen Mailverbund handelt. Aufgrund der besonderen Anforderungen an das De-Mail System bzgl. Technik, Sicherheit, Integritaet und Vertraulichkeit, ist es nicht moeglich, eine normale E-Mail an eine De-Mail Adresse zuzustellen. Eine De-Mail Adresse erhalten Sie hier: http://www.telekom.de/ de-mail Your e-mail was rejected because De-Mail is a closed mail group. Due to the special requirements of the De-Mail system regarding technology, security, integrity and confidentiality, it is not possible to send a normal e-mail to a De-Mail address. You can get a De-Mail address here: http:// www.telekom.de/ de-mail (in reply to RCPT command)
Reporting-MTA: dns; REDACTED Received-from-MTA: dns; REDACTED Arrival-Date: Wed, 04 Aug 2021 08:51:04 +0200 X-Original-ID: 56787f61-f4f0-11eb-aa4b-001a4a4cb9a5 Final-Recipient: rfc822; poststelle.hza-ffm@zoll.de-mail.de Action: failed Status: 5.7.1 Remote-MTA: dns; mx.de-mail-t-systems.de-mail.de (83.125.35.23) Diagnostic-Code: smtp; 554 5.7.1 <poststelle.hza-ffm@zoll.de-mail.de>: Recipient address rejected: Ihre E-Mail wurde abgewiesen, da es sich bei De-Mail um einen geschlossenen Mailverbund handelt. Aufgrund der besonderen Anforderungen an das De-Mail System bzgl. Technik, Sicherheit, Integritaet und Vertraulichkeit, ist es nicht moeglich, eine normale E-Mail an eine De-Mail Adresse zuzustellen. Eine De-Mail Adresse erhalten Sie hier: http://www.telekom.de/ de-mail Your e-mail was rejected because De-Mail is a closed mail group. Due to the special requirements of the De-Mail system regarding technology, security, integrity and confidentiality, it is not possible to send a normal e-mail to a De-Mail address. You can get a De-Mail address here: http:// www.telekom.de/ de-mail (in reply to RCPT command)