tech-man Posted August 7, 2018 Posted August 7, 2018 Has anyone come across the issue detailed below and managed to resolve it? I am struggling. https://support.microsoft.com/en-us/help/3212877/550-5-7-64-tenantattribution-relay-access-denied-smtp-error-when-sendi
tech-man Posted August 13, 2018 Author Posted August 13, 2018 Resolved this- was a FW issue presenting the wrong IP to MS
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