Jan 22 2019
- last edited on
Apr 01 2022
Our company ( hybrid, 600 E3 users) acquired a company ( calling it X 200 user exchange 2010) my question is when is the right time to add the domain name X.com to our office 365 environment.
we tried to add and confirm the ownership of domain with TXT it without changing MX records and we couldn`t sent out emails to firstname.lastname@example.org anymore.
I really appreciate if someone can list the major steps.
Jan 22 2019 10:02 AM
Jan 22 2019 10:56 AM
When you add the domain, you need to make sure to configure it as Internal Relay in Exchange Online. Otherwise, for any address associated with that domain, Exchange Online will attempt internal delivery, and will fail if no matching account was found. When you set the domain as Internal relay, it will still check for internal matches, but if no such are found it will redirect the message to where the MX record points at currently.
Jan 22 2019 10:59 AM
Jan 22 2019 02:35 PM
Thanks Adam, so if I understand correctly you are suggesting to :
1- have a trust set up between domains
2-sync the users in X domain to O365 using Adsync
3-Add the X domain to O365
4- migrate the mailboxes to O365
will this prevent the issue that already happened?We were just trying to confirm the ownership of the x.com in O365 and we weren't able to send emails out to x.com anymore.
Jan 22 2019 03:05 PM
Jan 22 2019 03:21 PM
Thanks for your reply. I was reading this documentation for the type of connectors
could you please point me out to the right one?
So although no DNS record was changed, just the TXT record added to domain ownership approval, and no service was enabled for the new domain it was an expected behavior?
Jan 22 2019 04:55 PM
Jan 22 2019 11:15 PM
@adam deltinger license is not a requirement generally speaking, as you can have valid Exchange recipients even without a license. But if a matching recipient exists, ExO will always try internal delivery first.
Connector might not be needed as well, depending on the configuration. And after all 200 users isn't that much, you can probably do the migration over a single weekend, and avoid dealing with complicated setups.
Jan 23 2019 06:20 AM
Hi Chris, I really appreciate your reply, in step 1 should I enable the Exchange services to proceed or I can leave it no configured.I am confused because we haven`t migrated any mailboxes from their end and haven`t decided if we going to do a cut-over or hybrid migration yet.
Jan 23 2019 07:21 AM
Jan 23 2019 07:41 AM
Jan 23 2019 01:36 PM
Thank you, as on our company we are using hybrid exchange, which method of migration make sense?
is there any easy way to give the users access to ourdomain email address, before setting up a trust between 2 Ad`s first?
Thank you so much!
Jan 23 2019 01:58 PM