CLoudflare is hosting mailwizz.zeitarbeits.eu. The domain zeitarbeits.eu has no A record. This domain was listed three years ago for participating in spam exactly as it does in the spam sample below. It belongs to Labas Group (aka Nermeka, Toltrade, Bau Gruppe, and other names).
SPAM SAMPLE:
Received: from mail0.labas-hire.com (mail0.labas-hire.com [141.95.160.192])
Date: Mon, 11 Apr 2022 10:##:## +0000
From: Viktorija <reply@labas-hire.com>
Reply-To: Viktorija <info@hirelabas.com>
Subject: Arbeitnehmerüberlassung
<snip>
Arbeitnehmerüberlassung osteuropäische Mitarbeiter für Produktion Logistik und Weiterverarbeitung
Arbeitnehmerüberlassungs
[ Temporäre Mitarbeitern/innen auf Basis der Zeitarbeit aus Litauen ]
[[ https://mailwizz.zeitarbeits.eu/index.php/campaigns/<x> ]]
<snip>
$ host mailwizz.zeitarbeits.eu
mailwizz.zeitarbeits.eu has address 172.67.134.95
mailwizz.zeitarbeits.eu has address 104.21.25.161
mailwizz.zeitarbeits.eu has IPv6 address 2606:4700:3030::6815:19a1
mailwizz.zeitarbeits.eu has IPv6 address 2606:4700:3037::ac43:865f
Domain: zeitarbeits.eu
Script: LATIN
Registrant:
NOT DISCLOSED!
Visit www.eurid.eu for webbased WHOIS.
On-site(s):
NOT DISCLOSED!
Visit www.eurid.eu for webbased WHOIS.
Registrar:
Name: Registrar.eu
Website: https://www.openprovider.com
Name servers:
lila.ns.cloudflare.com
ethan.ns.cloudflare.com