I have a question regarding email relaying in Hybrid Configuration Setup as mentioned below,
External Email Gateway (Forcepoint Cloud Security - MX Record holder)
HCW is setup with Centralized Transport Enable.
External Email lands on FP and forwarded to Exchange on-Prem. and redirected to Exchange Online if mailbox is not available on-Prem.
We want Forcepoint to Send Email to Exchange Online and from EOL to On-Prem.
Forcepoint <>EOL <> Exchange2016
As per my understanding following is the plan I have scoped.
Forcpoint: Fairly Simple
Connector to Send Emails to EOL
Connctor to Receive Emails from EOL
Disable Send Connector (External Emails to Forcepoint)
Modify Send Connector (Emails to EOL)
change Address space from @mydomain.onmicrosoft.com to *
Exchange Online: (O365)
New: Email Receive connector from Forcepoint IPs to Exchange Online
New: Email Send Connector Send * from Exchange Online to Forcepoint via FP Smart Host
Modify Email Send Connector From EOL to On-Prem. Exchangechange address space from * to @mydomain.com & change -RouteAllMessagesViaOnPremises from True to False
This is high level plan. My only concern is if email from Internet to EOL, Mailbox not available on EOL, should it automatically check for send connector created from EOL to On-Prem or would I need to change Authoritative Status of my accepted domain setting?
Any other advise would also be appreciated.
Thank you & regards,
No need to set to internal relay on-prem - you can leave as authoritative there - in hybrid you have remote mailboxes on-prem that represent the mailboxes in 365. Any mail that on-prem Exchange gets for those remote mailboxes will be routed to the remote routing address of the on-prem remote mailbox via the hybrid send connector.