In this scenario, the NDRs often have null as the SMTP envelope sender (P1 sender), but the SMTP header sender domain (P2 sender domain) is your organization’s accepted domain in Microsoft 365. Your organization hosts email on-premises, and you need to relay non-delivery reports (NDRs) generated by your on-premises system through Exchange Online.Possible scenarios that are affected by this change include, but may not be limited to: This change may affect your organization’s email routing or delivery. The sending host’s IP address or certificate domain on the SMTP connection matches your organization’s Inbound Connector of OnPremises type.Īfter November 1, 2023, if either of the above conditions are not met, the relay attempt from your on-premises environment to Exchange Online will be rejected.SMTP envelope sender domain in the MAIL FROM command (P1 sender domain).After we remove this condition, relaying email through Exchange Online will require the following: On November 1, 2023, we are removing the matching condition for the SMTP P2 sender domain (1c above).
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