Forum Discussion
Office 365 multi tenant architecture and deployment
I don't need to add the same domain to both tenants. Only sending and recieving mails over the same domain is my goal. At tenant A i can work maybe with a exchange sending connector. But what a bout tenant B? He need to redirect incomming mails for users in tenant A to Tenant A?
Is maybe a better solution when i install one AD Server in Azure and connect both clients to them?
You need it as accepted domain in order to receive messages. As I mentioned there are several workarounds (use the default domain, use subdomain, use forwarding), but it depends on the details.
Not sure what a server in Azure will help you with the task at hand. Is the question perhaps about only a few people needing such functionality, so that you can for example configure both tenant-a and tenant-b profile in the same Outlook client?
Not really, because tenant A don't have their own external mailadress. Only using the mailbox in tenant A but sening and recieving mails should go over tenant b.
My Idear was to place a Ad Server in Azure with AD Synch and connect both tenants to them.
Sending messages from Tenant B to Tenant A is easy. I create a contact in tenant b with a riderect to the onmicrosoft address of tenant a. You need to set the smtp alias from tenant b as default in this contect after creating. Now when i send a mail to user1@tenant-b.com it will be redirectet to user1@tenant-a.com. In the mail the recieptentadress is user1@tenant-b.com. So incoming is working good. Know i need tell tenant-a that they can send in the name of tent-b.com. But i can't add an accepted domian to the exchange of tenant-a.
How can i configure the exchnage on tenant a to connect to tenant b for sending mails in the name of tenant b?
Hi Christoph
As VasilMichev mentioned, it's not possible. A user in Tenant A who has smtp addresses from tenant-a.com domain cannot have an smtp address from tenant-b.com to send emails. Reason is tenant-b.com is not added to Tenant A and the tenant-b.com domain is already added to Tenant B. Therefore you cannot add that doamin to Tenant A or vice versa.
Best option I see here is, if the user count that requres this ability in Tenant A is less, create accounts for those users in Tenant B.
Thank you.
Muditha Chathuranga
