The following message to Jan.nick.dresia@outlook.de 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 [AS8PR03MB6807.eurprd03.prod.outlook.com 2026-04-30T07:52:55.559Z 08DEA67D5CE8A91B] [DB8PR06CA0058.eurprd06.prod.outlook.com 2026-04-30T07:52:55.566Z 08DEA61ECBD1D4E0] [DB5PEPF00014B8E.eurprd02.prod.outlook.com 2026-04-30T07:52:55.565Z 08DE9FA9D9FBA7C1]"