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Exchange Hybrid with Office 365. Dynamic Distribution Groups

Posted on 2016-08-05
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Last Modified: 2016-08-08
Hi,

i need a little help with Dynamic Distribution Groups in Exchange Hybrid with Office 365.
So i have some users up in Exchange Online, created in cloud (not synced from AD - I have those, but this is not regarding them).

Now this client wants to include those users created In Cloud, in on-premises DDL (all users group), so that when they send email to all users, both users on-premises and those in cloud will receive it. ATM, only on-premises users are receiving it.

Any hint?

Regards,
Ivan.
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Question by:Ivan
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by:Ivan
ID: 41743974
PS: I taught that i could maybe:
1. create some in-cloud DDL that will hold all in-cloud users,
2. create new on-premises user/mailbox,
3. create mail contact with external email address of that in-cloud DDL

After that configure forward on new user (step 2) to forward all email to mail contact (step 3). Problem with this is that in-cloud users will not receive email from same user as on-premises, since that email is forwarded to them via some other account..

Maybe this is not much of a problem...
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by:Vasil Michev (MVP)
ID: 41744022
You can create a mail user/contact object on-prem with the user@tenant.mail.onmicrosoft.com alias (or set it as targetname). For example, if you have a user john@domain.com in the cloud, he should also have john@domain.mail.onmicrosoft.com alias. Set this one as the proxyaddress (or better yet, the targetaddress) for the on-prem object, and mail will be delivered to the corresponding cloud mailbox.
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by:Ivan
ID: 41744032
Hi,

to be able to include mail contacts to DDL, you need to include that type of object into it, since it is only sending to mailbox users atm.
Problem is, if i have 100 mail contacts, and only 5 are those in-cloud, how am i gonna tell exchange just to send to those 5, and not to rest 95?

I taught to use attributes, but then that would require to set attributes on all on-premises users and those mail enabled contacts..if i'm not mistaking?

Hmm..
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Vasil Michev (MVP) earned 500 total points
ID: 41744060
Create a mail user/mail contact on-prem, as noted above. You cannot include objects that are cloud-only in a DDL that's created on-prem, thus you need the objects on-prem. You can adjust the DDL filter as needed to include only the ones you want.
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