Mail Reports uses wrong domain

We are running multiple domains and some users receive a weekly mailreport. Although a scheduled cron job is running every 30 minutes, the mail contains a wrong “Send by” line.

From is fine, but in the report it says in the topline e.g.

Zeitspanne: Woche 18.–24. Juli 2022
Gesendet von https://www.someotherdomain.de