We have two tenants TenantA and TenantB. There is a third party filtering service in front of both and routes Internet email to the appropriate tenant after filtering. We want to create a direct connection between the tenants. If I create a connector for TenantA from O365 to Partner Organization's Smart Host TenantB.mail.protection.outlook.com, that seems like it could work.
On the TenantB side, we have a receive connector that is locked down to only receive mail from the third party filtering service and their range of IP's. I could allow EOP's IP ranges, but that seems like it could be abused.
Anyone implement direct connectors between tenants for email exchange involving smart hosts instead of MX records?
Best regards,
Scott
