Authentication failures
Incident Report for MailChannels
We identified that the elevated error rates were caused due to a failed deployment. We have reverted the deployment to a known good configuration. There should be no errors at the moment.

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Posted Jul 09, 2019 - 16:24 PDT
We are currently investigating elevated error rates on our inbound filtering service. Some customers are reporting relay errors in the form "554 5.7.1 : Relay access denied".
Posted Jul 09, 2019 - 15:22 PDT
This incident affected: Inbound Filtering (SMTP Service).