![]() Moreover, I have sent you a private message to collect the entire non-delivery report (NDR). Can you please try sending to accounts or accounts? It will help us narrow down the root cause. I see that you encounter this issue when sending emails to multiple external domains. Are users using Outlook client (such as Outlook 2016) to send their emails? If yes, please let them try using Outlook Web App (OWA) and see if the same issue occurs.ģ. Are users hosted in Exchange Online or Exchange on-premises? What about users?Ģ. ![]() ![]() Do you mean the issue occurs when emails are sent from to external email addresses, while it works fine when emails are sent from ?Īlso, please help us confirm the following details:ġ. I understand this is an Exchange hybrid deployment and there are two domains being used.
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