![]() 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). The sending host’s IP address or the certificate domain on the SMTP connection matches your tenant’s Inbound Connector of OnPremises type.SMTP header sender domain, as shown in email clients (P2 sender domain).SMTP envelope sender domain in the MAIL FROM command (P1 sender domain) or.SMTP certificate domain on the SMTP connection or.Any of the following is an accepted domain of your organization:.If your organization does not use Inbound Connectors of OnPremises type then this change will not affect you.Ĭurrently, to relay email through Exchange Online, two conditions must be true: See our Add 2-Step Verification to Your Account for information on how to enable it.Today, we are announcing an update to our requirements for SMTP relay through Exchange Online. Make sure that you have enabled 2-Step Verification (2SV) as an added security measure to keep others out of your account. Note: For security reasons, the previous email address will receive an alert that a change has been made. For help on resetting the account password, check out the Forgot My Password article. You must know the account password to change the email address. ![]()
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