The following message to mattia.comodi@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 [DU0PR02MB8978.eurprd02.prod.outlook.com 2026-05-12T06:15:06.673Z 08DEAFB5894A3E13] [DUZPR01CA0022.eurprd01.prod.exchangelabs.com 2026-05-12T06:15:06.676Z 08DEAF0E2B98FAD4] [DU2PEPF00028D0A.eurprd03.prod.outlook.com 2026-05-12T06:15:06.675Z 08DEADCC8A068336]"