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Issue delivering automatic system emails to Outlook.com / Hotmail (550 5.7.515 Authentication error)

in Recruiting, Opportunity Marketplace

Summary:

Automatic system emails to Outlook.com/Hotmail are being rejected with 550 5.7.515 despite valid SPF, DKIM and DMARC configuration.

Content (please ensure you mask any confidential information):

We have been using Recruiting Cloud with a vanity email configuration successfully for a long time (more than 2 years). A few days ago, emails sent to Microsoft consumer domains (Outlook.com, Hotmail.com, Live.com, etc.) suddenly started being rejected with 550 5.7.515, despite no changes being made to our configuration.

Messages sent to Gmail and other providers are delivered successfully, but messages sent to Microsoft consumer domains (Outlook.com, Hotmail.com, Hotmail.es, Live.com, etc.) are rejected with:

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