NDR message is not specific

Question

hayI sent an email to 2 different emails addresses.one of the addresses is in our tenant block list therefore I received an NDR message that both of the recipients didn't get the mail because they are in the tenant block list although only one of them is in this list.So in the future, how will I know which email address is in our tenant block list when i get an NDR message ?&nbsp;ThanksElad

elieelkarkafi · Answer

eladfe&nbsp;Hi , you can check the tenant allow/block lists section in DFO. and remove any email previously blocked&nbsp;&nbsp;&nbsp;

eladfe · Answer

But I want to know exactly which email address in the NDR message is on the block list.For example; If the NDR message contains 20 emails addresses its very frustrating to check each one of them

elieelkarkafi · Answer

usually the NDR message contains "Delivery has failed to these recipients or groups" and it will list the recipients lists

refer to the below link to check the type of errors generated by NDR

https://learn.microsoft.com/en-us/exchange/troubleshoot/email-delivery/ndr/non-delivery-reports-in-exchange-online

eladfe · Answer

The NDR message :Remote server returned '550 5.7.703 Your message can't be delivered because one or more recipients are blocked by your organization's tenant recipient block policy. AS(8910)'And this message is for both email address although one of them is not on the tenant recipient block policy .

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NDR message is not specific

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