toRecipients list is wrong for Non Delivery notifications

Natalia Dobryaeva 21 Reputation points
2021-06-18T05:09:43.03+00:00

toRecipients list of the NDN message contains email addresses of the recipients that failed:

User with email address "user@test .com" sends email to an invalid (non-existing) email address "aaa@test .com". Then this user recieves a Non Delivery Notification. Outlook 365 web client displays NDN correctly and "TO" field contains email "user@test .com". But MS Graph Message object contains toRecipients list with "aaa@test .com" inside instead of the real recipient of this NDN message - "user@test .com".

Please, advise, how to identify the real "toRecipient" for such messages? And how to identify that the message is Non-delivery notification?

Thanks.

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