For example, some hosts might invalidate DKIM signatures, causing false positives. We always recommend that you point your MX record to Microsoft 365 or Office 365 in order to reduce complexity.For more information about connectors in Exchange Online, see Configure mail flow using connectors. Use the procedures in this article to enable Enhanced Filtering for Connectors on individual connectors. For more information about explicit and implicit email authentication, see Email authentication in EOP.įor more information, see the What happens when you enable Enhanced Filtering for Connectors? section later in this article. Able to use explicit email authentication (SPF, DKIM, and DMARC) to verify the reputation of the sending domain for impersonation and spoof detection.Better post-breach capabilities in Automated investigation and response (AIR).Improved accuracy for the Microsoft filtering stack and machine learning models, which include:.
In these scenarios, you can still get the most out of Exchange Online Protection (EOP) and Microsoft Defender for Office 365 by using Enhanced Filtering for Connectors (also known as skip listing).Īfter you enable Enhanced Filtering for Connectors, mail routing in complex routing scenarios looks like this:Īs you can see, Enhanced Filtering for connectors allows IP address and sender information to be preserved, which has the following benefits: This behavior isn't a limitation of Microsoft 365 it's simply how SMTP works. The message arrives in Microsoft 365 with a different source IP address. Mail routing in complex scenarios looks like this:Īs you can see, the message adopts the source IP of the service, appliance, or on-premises Exchange organization that sits in front of Microsoft 365.
Properly configured inbound connectors are a trusted source of incoming mail to Microsoft 365 or Office 365.
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