The send-mailmessage : mailbox unavailable. the server response was: 5.7.64 tenantattribution; relay access denied is known to be due to
- A person has use an inbound connector in Microsoft 365 that is said to be configured to employ the use of a certificate from on-premises to know or verify the presence or the identity of the submitting server.
- The IP address that's configured in the Microsoft 365 connector is one that do not match the IP address that is said to be used by the submitting server.
What are the Symptoms of the case above?
In the issue above, the likely symtoms occurs if the user has send mail externally, and they tend to receive the error message: 550 5.7.64 TenantAttribution; Relay Access Denied SMTP.
Therefore, The send-mailmessage : mailbox unavailable. the server response was: 5.7.64 tenantattribution; relay access denied is known to be due to
- A person has use an inbound connector in Microsoft 365 that is said to be configured to employ the use of a certificate from on-premises to know or verify the presence or the identity of the submitting server.
- The IP address that's configured in the Microsoft 365 connector is one that do not match the IP address that is said to be used by the submitting server.
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