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 [SN7PR01MB8135.prod.exchangelabs.com 2026-04-29T10:09:48.621Z 08DEA58EAB312D2F] [PH8PR20CA0009.namprd20.prod.outlook.com 2026-04-29T10:09:48.630Z 08DEA5AA189F5030] [CY4PEPF0000E9CF.namprd03.prod.outlook.com 2026-04-29T10:09:48.645Z 08DEA166A7E87CDF]"