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 [PAVPR02MB9428.eurprd02.prod.outlook.com 2026-05-12T11:42:56.066Z 08DEAFCA5FE3F075] [AS4P189CA0018.EURP189.PROD.OUTLOOK.COM 2026-05-12T11:42:56.068Z 08DEAFD4E2726259] [AM4PEPF00027A65.eurprd04.prod.outlook.com 2026-05-12T11:42:56.073Z 08DEADC3164F547D]"