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0100017a37bfffb6-1f5. . . Office 365 jan.hohberger
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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: 6/23/2021 7:22:47 AM
Sender Address: 0100017a37bfffb6-1f52671b-b397-401b-9ec0-2087d176934a-000000@amazonses.com
Recipient Address: jan.hohberger@uts.edu.au
Subject: CALL FOR PDW PROPOSALS: DRUID21 Copenhagen, October 18-20, 2021

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 [n3fgLOb7M5mbnNdPcqT-YA.au60]
DSN generated by: SYCPR01MB5262.ausprd01.prod.outlook.com

Message Hops
HOP TIME (UTC) FROM TO WITH RELAY TIME
1 6/23/2021
7:22:50 AM
a8-51.smtp-out.amazonses.com relay.mimecast.com ESMTP 3 sec
2 6/23/2021
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3 6/23/2021
7:22:56 AM
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Date: Wed, 23 Jun 2021 07:22:47 +0000
From: DRUID21 <druid@druid.dk>
To: Jan Hohberger <jan.hohberger@uts.edu.au>
Message-ID: <0100017a37bfffb6-1f52671b-b397-401b-9ec0-2087d176934a-000000@email.amazonses.com>
Subject: CALL FOR PDW PROPOSALS: DRUID21 Copenhagen, October 18-20, 2021
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