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We are in a hybrid Exchange Infrastructure setup. Our nested DLs are still hosted in on-prem. We have migrated one of the DLs (#All IND - Subiaco) that is a member of "#Global IT - All" (by deleting the "#All IND - Sub" from the on-prem then recreating it in Exchange Online). And then we create an on-prem mailcontact with the external smtp address of " #ALLInd-Sub@ newmontmining.mail.onmicrosoft.com". It is also one of the alternate SMTP address of the migrated DL. If we sent an individual email to the on-prem mail contact, it is being redirected or sent to the migrated DL. But when we send emails to "#Global IT - All" which is a parent group of mail contact, the email is not being redirected to the migrated DL. We did a message trace but no result is showing.
@JustinMicheal-7973
I test it in my organization, I would send email successfully:
Here are detailed information about it:
Send to external from Exchange on-premises successfully:
Received from Exchange online:
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This did not work for me
What is the detailed information about mail flow in your organization? You need to check in above way to know which step this email stopped.
Our infra is a hybrid infrastructure.
We have Exchange 2016 in on-prem and Exchange Online.
User mailboxes are still synching from on-prem to Exchange online.
On the other hand, some of our DLs are still in on-prem and some are already pure cloud.
My lab is also in such topology, above commands could be used to check whether email are blocked.
Please help me with the detailed commandlets
Here are they, you need to send a test email, then use commands below to check them(You need to change the value into the correct one in your organization):
Exchange On-premises:
Get-TransportService | Get-MessageTrackingLog -Sender "sender@domain.com" -MessageSubject "subject" -Start M/D/Y -End M/D/Y | Sort-Object Timestamp
Exchange online:
Get-MessageTrace -StartDate M/D/Y -EndDate M/D/Y -SenderAddress sender@domain.com | Sort-Object Received
For more detailed information about them, you could have a look about those two articles:
let me check with our OUs that are not synching.
One thing I noticed is that the mail-contacts that we have created are showing as a sync error in our AD connect.
let me check with our OUs that are not synching.
One thing I noticed is that the mail-contacts that we have created are showing as a sync error in our AD connect.
should the online group in Exchange Online have the same email address with on-prem mail contact?
Yes, you need to use the same email address. So, you need to create this Mail contact in a non-synchronized OU. Otherwise, there will exist email address conflict.
Ah no..
For this one, I thought that we shouldn’t sync the on-prem mail contact?
You could create a independent non-synchronized OU for this mail contact(Only have this one mail contact in it). It doesn't effect the using of other mail contact.
sure ty testing it
@JustinMicheal-7973
I am writing here to confirm with you any update about this thread now? Could you send email successfully now?
If the above suggestion helps, please be free to accept it as an answer for helping more people.