We would like to forward incoming Office365 undeliverability mails ("Office 365 Your message to ... couldn“t be delivered ...) containing a special phrase within subject or body to a different mailbox. Unfortunately proper mail rules seem not to work with these type of incoming mails. Tests with "normal" incoming mails work fine. Can anybody help?
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Based on my knowledge and testing on my lab, you seems cannot create a inbox rule or mail flow rule to forward NDRs to another users, since system-generated message couldn't be forwarded automatically.
In addition, here's a similar thread for your reference: Setting up a rule to forward "undeliverable" reports (NDR) to a different mailbox
Joy Zhang
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