The following message to wassim-mabrouk@hotmail.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 [AS8PR10MB6197.EURPRD10.PROD.OUTLOOK.COM 2026-04-08T15:39:46.341Z 08DE8FC11C628FD2] [AM0PR10CA0026.EURPRD10.PROD.OUTLOOK.COM 2026-04-08T15:39:45.622Z 08DE957DC1CB04D3] [AM4PEPF00027A5F.eurprd04.prod.outlook.com 2026-04-08T15:39:46.345Z 08DE8F810857B7C3]"