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 [DB9PR10MB5667.EURPRD10.PROD.OUTLOOK.COM 2026-04-02T11:48:52.217Z 08DE8F574A6B1E0E] [AM0PR10CA0014.EURPRD10.PROD.OUTLOOK.COM 2026-04-02T11:48:35.829Z 08DE8EAFA3E3FF4D] [AM2PEPF0001C711.eurprd05.prod.outlook.com 2026-04-02T11:48:52.223Z 08DE907EF0119A58]"