Forum Discussion
NDR Emails Not Appearing in Group Mailbox
I've encountered an issue with non-delivery reports (NDR) when sending emails from a Teams group mailbox.
When I send an email from my personal company email address to a non-existent address, I correctly receive an NDR in my inbox. However, when I do the same from a Teams group email address, no NDR is delivered to the group mailbox.
Upon checking Exchange Message Trace, I can see that the NDR is being sent to the group mailbox, but it is delivered to the "RecoverableItemsDeletions" folder.
I believe this issue may have started after switching to the New Groups in Outlook. Previously, it seemed to work fine.
Can anyone assist with resolving this? Thank you in advance for your help.
I came across a similar issue in this Reddit thread, but unfortunately, there was no solution provided there either.
https://www.reddit.com/r/exchangeserver/comments/1ak69hv/comment/kp62eh0/
and here:
https://www.michev.info/blog/post/2731/did-you-know-ndr-messages-and-group-mailboxes
- This is by design and has worked like that for years, my article above is from 2019. If any user has subscribed to the group, they will receive any NDR messages as well, but they will not find them in the Group mailbox.
VasilMichev Thanks, good to know this was the idea, by design.
But then I do not understand why the NDR message is not send to the mailboxes of the subscribers of the Teams group. The follwoing I see in the Drop event:
Reason: [{LED=554 5.4.187 RESOLVER.GRP.SuppressGroupExpansion; Suppress group expansion so messages are not sent to the group members.};{MSG=};{FQDN=};{IP=};{LRT=}]
So there must be a reasen why it is not send.
All settings I can find are set to on, so it should be send. Also the Teams group is open to receive messages from outside the organisation.
