Reporting-MTA: dns;mx.kuv.de
Received-From-MTA: dns;kuv24-manager.de
Arrival-Date: Mi, 01 Jun 2022 10:00:37 +0200

Final-Recipient: rfc822;streit-407-59.heimstetten@t-online.de
Last-Attempt-Date: Mi, 01 Jun 2022 10:00:37 +0200
Action: Failed
Status: 5.1.1
Diagnostic-Code: smtp;550-5.1.1  user unknown 
550 5.1.1  Unknown recipient.