The following message to ellen-just@outlook.de 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 [DB9PR08MB6508.eurprd08.prod.outlook.com 2026-03-05T16:57:34.526Z 08DE7A6C566BBEA2] [AS4P189CA0045.EURP189.PROD.OUTLOOK.COM 2026-03-05T16:57:34.520Z 08DE78CF9ED57979] [AM4PEPF00027A6A.eurprd04.prod.outlook.com 2026-03-05T16:57:34.570Z 08DE7992F7C2F566]"