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550 5.7.64 TenantAttribution; Relay Access Denied

Alan Temperly

Using XG230, email MTA mode with Office365. Have it configured but unable to send emails. Get the following message.

 

550 5.7.64 TenantAttribution; Relay Access Denied [BY2NAM03FT033.eop-NAM03.prod.protection.outlook.com]

 

Sophos support has been unable to troubleshoot a solution for this issue.  Any suggestions?

Thank you.



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