The following message to johann.soetbeer@outlook.com was undeliverable. The reason for the problem: 5.3.0 - Other mail system problem 550-"5.7.515 Access denied, sending domain LISTS.FSMPI.RWTH-AACHEN.DE doesn't meet the required authentication level. The sender's domain in the 5322.From address doesn't meet the authentication requirements defined for the sender. To learn how to fix this see: https://go.microsoft.com/fwlink/p/?linkid=2319303 Spf= Pass , Dkim= Fail , DMARC= Pass [SA1PR01MB6608.prod.exchangelabs.com 2026-05-07T06:15:07.853Z 08DEABE3EF82B01D] [IA4P220CA0008.NAMP220.PROD.OUTLOOK.COM 2026-05-07T06:15:07.901Z 08DEABF4F3CC59E3] [BL6PEPF0001AB76.namprd02.prod.outlook.com 2026-05-07T06:15:07.885Z 08DEA7433E0EDD67]"