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 [GVXP195MB1782.EURP195.PROD.OUTLOOK.COM 2026-06-11T09:26:10.287Z 08DEC59619A56D04] [CH5PR05CA0023.namprd05.prod.outlook.com 2026-06-11T09:26:10.347Z 08DEC76D8EB5C233] [CH1PEPF0000AD7E.namprd04.prod.outlook.com 2026-06-11T09:26:10.350Z 08DEC3DD2E3C9F3F]"