Outlook 365 Recent changes to "Undeliverable" automated replies?

D

dlawson

New Member
OS Version(s)
  1. Windows
Outlook version
Outlook 365 64 bit
Email Account
Outlook.com (as MS Exchange)
Operating system::    Windows 10, 11
Outlook version:     Outlook 365 classic
Email type or host:    Microsoft 365
We noticed around the end of March of this year that the "Undeliverable" automated replies/rejections we occasionally receive (sometimes due to a mistyped address, sometimes due to an overly aggressive spam filter) no longer contain attachments. Prior to this, the rejections would contain an "Outlook item" attachment that contained a copy of the original e-mail sent to that address, along with the original file attachment if any, but the rejections now do not include any sort of attachment at all. Has something recently changed with the way "Undeliverables" are handled?
 
I had one recently that still had the email - opened it, fixed the address and resent.

This is from mac Outlook, so it looks different than windows, but it has the email attached.

1744233004809.png
 
Thanks for the reply. That is similar to what we used to see, but no longer. We determined that rejections from 3/21/25 still have the attachments and rejections from 3/24/25 onward don't, so "something" must have happened over that weekend.
 
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