Microsoft Defender for Office 365
Email and collaborationEmail Authentication Dkim Configure
In brief
The documentation changed its wording from “Exchange 2016 and Exchange 2019” to “Exchange 2016 and later” when describing message modifications that can affect DKIM.
What Defender admins need to know
Administrators using Exchange versions later than 2016 should consider that message changes may affect DKIM.
Summaries are generated from the documentation change itself.
Documentation change
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To diagnose and fix email authentication failures, see Troubleshoot email authentication in Microsoft 365.
@@ -905,4 +905,4 @@ For mail coming _into_ Microsoft 365, you might also need to configure trusted A To diagnose and fix email authentication failures, see [Troubleshoot email authentication in Microsoft 365](email-authentication-troubleshoot.md). > [!TIP]-> Exchange 2016 and Exchange 2019 are known to modify messages that flow through them, which can affect DKIM.+> Exchange 2016 and later are known to modify messages that flow through them, which can affect DKIM.