[Sprechstunden] Delivery Status Notification (Failure)

The following message to zcekiz@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 [FRWP190MB2451.EURP190.PROD.OUTLOOK.COM 2026-05-12T12:58:31.512Z 08DEAFDFCE7F24EF] [MW4PR02CA0020.namprd02.prod.outlook.com 2026-05-12T12:58:31.585Z 08DEAFDC03DA7245] [CO1PEPF00012E7E.namprd03.prod.outlook.com 2026-05-12T12:58:31.580Z 08DEADAE57FCE53B]"