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Exchange SMTP Auth Fails with: 451 4.7.0 Temporary server error. Please try again later. PRX5
Office 365 refuses SMTP authentication with error: 451 4.7.0 Temporary server error. Please try again later. PRX5 This is when accessing External Send SMTP AUTH through OAUTH2 authentication. Initia...
How can i check for updates on this? I have this same issue connecting Zoho > smtp with the above error.
Thanks
My original post contains the way to solve the problem. Check the user's permissions. Global Admin plus anything else resultsin this error.