Forum Discussion
Delayed delivery for Dynamic Distribution Groups
Hi ArjanBroekhuizen,
As per your description, all the users from the DDG receive the messages, but some of them quite delayed. Probably it's not related to this, but I would suggest to have a look to this article and confirm that the DDG is configured correctly for that hybrid environment:
https://learn.microsoft.com/en-GB/exchange/troubleshoot/groups-and-distribution-lists/dynamic-distribution-group-members-not-receive-emails
Thanks for your reply. I have read the article. We don't have this issue; all accounts are member of the DDG and they all receive the mail. Only not all within a few minutes. Sometimes up to an hour.
Hi ArjanBroekhuizen,
Thanks for confirming.
In that case, had you the chance the check a message header of a delayed message? There we should be able to see if there's any loop or where the message was stuck. It could also be useful to compare it with one delivered in time.
On the other hand, in O365 you have the queue report. Maybe there's something that gives you a light on this:
Exchange Online Admin Center - Reports - Mail Flow
- Hello FcoManigrasso,
Thanks again. When I check the header, I see the delay is between our environment and protection.outlook.com. The first hops (total 😎 are within seconds; so internal in Exchange 365, sending to our on-premise server and interal processing aren't delayed. The last three hops, the processing in Exchange 365 to the mailbox, also aren't delayed.
It is only the hop to Exchange 365 that is delayed.