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Status code: 550 5.7.23

This error occurs when Sender Policy Framework (SPF) validation for the sender's domain fails. If you're the sender's email admin, make sure the SPF records for your domain at your domain registrar are set up correctly. Office 365 supports only one SPF record (a TXT record that defines SPF) for your domain. Include the following domain name: spf.protection.outlook.com. If you have a hybrid configuration (some mailboxes in the cloud, and some mailboxes on premises) or if you're an Exchange Online Protection standalone customer, add the outbound IP address of your on-premises servers to the TXT record.

For more information and instructions about configuring SPF records see Customize an SPF record to validate outbound mail sent from your domain and also External Domain Name System records for Office 365.

Original Message Details
Created Date: 10/30/2021 12:10:50 PM
Sender Address: 0100017cd11c11da-27da446e-f109-42e0-87d6-587e61f55d91-000000@amazonses.com
Recipient Address: jan.hohberger@uts.edu.au
Subject: [EXTERNAL] FIRST CALL FOR PAPERS: DRUID22, Copenhagen, June 13-15, 2022

Error Details
Reported error: 550 5.7.23 The message was rejected because of Sender Policy Framework violation -> 550 SPF Sender Invalid - envelope rejected - https://community.mimecast.com/docs/DOC-1369#550 [iGAjbLKZN_W8TRYvjCOvsA.au19]
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Date: Sat, 30 Oct 2021 12:10:50 +0000
From: DRUID22 <druid@druid.dk>
To: Jan Hohberger <jan.hohberger@uts.edu.au>
Message-ID: <0100017cd11c11da-27da446e-f109-42e0-87d6-587e61f55d91-000000@email.amazonses.com>
Subject: [EXTERNAL] FIRST CALL FOR PAPERS: DRUID22, Copenhagen,  June 13-15,
 2022
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