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Outlook | Web | Outlook.com | Email
Sending, receiving, and organizing email in Outlook.com
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This error usually means the recipient’s mail server could not verify that the sending server was authorized by the domain’s SPF record.
Are you sending from a personal Outlook.com/Hotmail account, or from a work/business email address using a custom domain? Also, please share the exact bounce-back error code or message, with any personal information removed.
If it is a custom domain, the domain administrator will need to check that the SPF DNS record includes the service currently sending the email. Avoid creating multiple SPF records, as this can also cause validation failures.
Thank you for your time