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Yes, by design and can't be changed:
See my answer here:
https://learn.microsoft.com/en-us/answers/questions/143962/return-path-is-empty-in-auto-reply-out-of-office-r.html
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Can you confirm if the Out of office replies have blank 'envelope/smtp From address' by design? Or is there a way to populate the 'envelope/smtp From address' with the senders address?
Yes, by design and can't be changed:
See my answer here:
https://learn.microsoft.com/en-us/answers/questions/143962/return-path-is-empty-in-auto-reply-out-of-office-r.html