Forum Discussion
Can't send messages between O365 domains
HI, we have two domains in Office 365: Domain1 synced with on premise AD with Azure AD Connect. I can assign licenses to users in O365 console, but for mail server we use on premise Exchange and that works well for years. Also we have new domain in O365 -Domain2 which supposed to be fully cloud. It's MX records pointing to Exchange online.
I can send messages from Domain2 to any domain except Domain1.
All messages from Domain2 to Domain1 don't get to Exchange on premise mailboxes, which we use. They get to Exchange online mailboxes of Domain1 instead.
How can we fix that?
Thanks
Andy
Go to the EAC and configure domain1 as Internal Relay. That way Exchange will no longer try to deliver the messages internally, but instead will look at the MX record and send them on-premises.
7 Replies
Go to the EAC and configure domain1 as Internal Relay. That way Exchange will no longer try to deliver the messages internally, but instead will look at the MX record and send them on-premises.
Thanks Vasil.
I already tried to do that, but wasn't able to configure connector. It was saying that I cant use email address hosted on O365 for connector validation.
I thought that it meant I cant use email in domain hosted on O365, but the trick was to use unlicensed user.
I'll set up connector , but probably will need help of my Exchange hosting operator, because I'm not sure about correct exchange server name and other settings.
There's no need for connectors in your scenario, ignore the warning.
