[Druid] Undelivered Mail Returned to Sender

This is the Mail-Delivery-Service. I'm sorry to have to inform you that your message could not be delivered to one or more recipients. For further assistance, please contact your Mailadmin. From: 01000184cd6a91e9-470742db-5e47-4e33-a4e2-9175e9a06f63-000000@amazonses.com To: sebastian.surma@zv.fraunhofer.de Subject: Invitation to become a reviewer for DRUID23 mail-mtaka28.fraunhofer.de[153.96.1.28] reply 550 #5.1.0 Address rejected.