550 5.1.90 NDR

%3CLINGO-SUB%20id%3D%22lingo-sub-2631003%22%20slang%3D%22en-US%22%3E550%205.1.90%20NDR%3C%2FLINGO-SUB%3E%3CLINGO-BODY%20id%3D%22lingo-body-2631003%22%20slang%3D%22en-US%22%3E%3CP%3EProblem%3A%20NDR%20%22Remote%20Server%20returned%20'550%205.1.90%20Your%20message%20can't%20be%20sent%20because%20you've%20reached%20your%20daily%20limit%20for%20message%20recipients.%22%3CBR%20%2F%3E%3CBR%20%2F%3EQuestion%201%3A%20the%20code%26nbsp%3B550%205.1.90%20doesn't%20exist%20under%20code%20description%20-%20can%20MSFT%20fix%20it%3F%26nbsp%3B%3CA%20href%3D%22https%3A%2F%2Fdocs.microsoft.com%2Fen-us%2Fexchange%2Fmail-flow-best-practices%2Fnon-delivery-reports-in-exchange-online%2Fnon-delivery-reports-in-exchange-online%22%20target%3D%22_blank%22%20rel%3D%22noopener%20noreferrer%22%3Ehttps%3A%2F%2Fdocs.microsoft.com%2Fen-us%2Fexchange%2Fmail-flow-best-practices%2Fnon-delivery-reports-in-exchange-online%2Fnon-delivery-reports-in-exchange-online%3C%2FA%3E%3CBR%20%2F%3E%3CBR%20%2F%3EQuestion%202%3A%20There%20are%20two%20recipient%20limits%20-%20Recipient%20rate%20limit%20%26amp%3B%20Recipient%20limit.%20Which%20one%20has%20been%20exeeded%20in%20case%20of%20550%205.1.90%3F%3CBR%20%2F%3E%3CBR%20%2F%3EQuestion%203%3A%20How%20to%20find%20in%20Exchange%20Online%20%2F%20M365%20Security%20a%20report%20that%20shows%20all%20NDRs%20for%20a%20domain%3F%26nbsp%3B%3CBR%20%2F%3E%3CBR%20%2F%3E%3CBR%20%2F%3E%3C%2FP%3E%3C%2FLINGO-BODY%3E%3CLINGO-LABS%20id%3D%22lingo-labs-2631003%22%20slang%3D%22en-US%22%3E%3CLINGO-LABEL%3EExchange%20Online%3C%2FLINGO-LABEL%3E%3CLINGO-LABEL%3ENDR%3C%2FLINGO-LABEL%3E%3C%2FLINGO-LABS%3E
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Problem: NDR "Remote Server returned '550 5.1.90 Your message can't be sent because you've reached your daily limit for message recipients."

Question 1: the code 550 5.1.90 doesn't exist under code description - can MSFT fix it? https://docs.microsoft.com/en-us/exchange/mail-flow-best-practices/non-delivery-reports-in-exchange-...

Question 2: There are two recipient limits - Recipient rate limit & Recipient limit. Which one has been exeeded in case of 550 5.1.90?

Question 3: How to find in Exchange Online / M365 Security a report that shows all NDRs for a domain? 


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