[Sprechstunden] Delivery Status Notification (Failure)

The following message to johann.soetbeer@outlook.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 [CH3PR01MB8285.prod.exchangelabs.com 2026-05-07T07:51:24.377Z 08DEAB30E68B97C5] [CH5P221CA0024.NAMP221.PROD.OUTLOOK.COM 2026-05-07T07:51:24.393Z 08DEABF5D51D9142] [CH1PEPF0000AD83.namprd04.prod.outlook.com 2026-05-07T07:51:24.388Z 08DEA751CED5DA7D]"