The following is a code example from send connector logs. In the send connector log, you can check for the thumbprint of the certificate that is given to Exchange Online. (Here we assume that the send connector name that's used for relaying to external domains through EOP is "outbound to Microsoft 365.")įor Exchange 2010 (Get-SendConnector "outbound to Microsoft 365").SourceTransportServers | foreach | Select-Object name,SendProtocolLogPath To find the location of the send connector logs, run the following cmdlet against the source servers that are listed in that send connector. Confirm the issue by enabling logging on the send connector that is used for routing mail to Microsoft 365 and checking those logs. If the new certificate isn't sent from on-premises Exchange to EOP, there may be a certificate configuration issue on-premises. Make sure that the new certificate is sent from on-premises Exchange to Exchange Online Protection (EOP) when users send external mail. Option 2: Change the inbound connector without running HCW Changes may take some time to take effect. When the Wizard has successfully completed, the value for the TLSSenderCertificate name should match the certificate that's used by the on-premises server. Make sure that the new certificate is selected on the transport certificate page.Download and run the Hybrid Configuration Wizard from the Exchange Online admin center.For more information, see Hybrid Configuration wizard. For information about what the values for the TLS Sender certificate were and changes that are made, see the HCW logs. Be aware that any manual customization to a hybrid configuration (which is uncommon) may have to be redone after the Wizard is finished. Rerun the Hybrid Configuration Wizard (HCW) to update the inbound connector in Exchange Online. Option 1: Rerun the HCW to update the inbound connector (recommended for hybrid customers) To identify the submitting server and authorize relay, there must be a connector that is configured correctly in Microsoft 365, and the connector must match the submitting server. The IP address that's configured in the Microsoft 365 connector no longer matches the IP address that's being used by the submitting server.This may be due to a configuration change on-premises or a new/renewed certificate that uses a different name. However, the certificate on-premises no longer matches the certificate that is specified in Microsoft 365. You use an inbound connector in Microsoft 365 that's configured to use a certificate from on-premises to verify the identity of the submitting server.This issue is due to one of the following reasons: When users send mail (that is relayed out through Microsoft 365) externally, they receive the following error message:ĥ50 5.7.64 TenantAttribution Relay Access Denied SMTP.
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