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Remote Server returned '550 5.7.750 Service unavailable. Client blocked from sending from unregister
We have hybrid exchange environment by using exchange 2019 CU11 & Office365 On sudden, yesterday onwards on-premise exchange users email is rejected with error message. All other mail flow is wo...
Hi
The issue is not fixed yet.
The incident happened on 12th October and we opened multiple case from Microsoft with severity level A. Still no proper support and service is down in last 6 days
Hello, do you still have this issue?