The following message to nadyasergeyeva@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 [DU2P195MB2396.EURP195.PROD.OUTLOOK.COM 2026-06-12T05:45:11.423Z 08DEC5B397BFCE41] [PH1PEPF000132E4.NAMP220.PROD.OUTLOOK.COM 2026-06-12T05:45:11.490Z 08DEC7B04A483B43] [SN1PEPF000397AE.namprd05.prod.outlook.com 2026-06-12T05:45:11.500Z 08DEC3B661370BC0]"