Forum Discussion
Undelivered message expanded
Run a message trace and post the sanitized results here: https://docs.microsoft.com/en-us/office365/securitycompliance/message-trace-scc
Does this help?
It also appears to be flagged as spam, however the sender is allowed an sender.
You should have checked the details for the second entry there, the one with the Expand DL action. And you do have a Redirect event prior to that, which you should check as well.
I have seen those, and they do not provide any information.
The redirect detail is this "Redirect message. No detail information available".
The second message I assume you are referring to is the Expand DL "The message was sent to a distribution list (DL) That was expanded to the recipients of the DL"
This is the problem, the so called distribution list it's expanding to is NOT a distribution list and there is no detail in the message trace.
Like I said, the message trace is telling me it's being sent to a group that does not exist.
See below, I have changed the actual recipient to fakeuser123@fakedomain.com, which is a normal user mailbox, however, the message is telling me it's being delivered to the the group "fakeuser123@fakedomain.com", which is not a group, it is the users mailbox. Who never recieves the message.
The message was sent to the following group: fakeuser123@fakedomain.com. Office 365 received the message and sent it to the group members.
Group: fakeuser123@fakedomain.com
