OnDMARC

Configure Microsoft Office 365 / Exchange Online to reject emails that fail DMARC with a policy of reject instead of sending them to junk

How to make Office 365 reject emails
that fail DMARC

Authenticating Sharepoint Online with SPF and DKIM.

Microsoft Office 365 SPF and DKIM set up instructions. Increase your email deliverability and security with our OnDMARC product.

Information on how Microsoft Office 365 handles inbound emails originating from DMARC protected domains.

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