Mail Routing – G Suite to Office 365 (Exchange Online EOP)

During my day job, I get a lot of requests on how to migrate from G Suite to Office 365. BitTitan MigrationWiz can take care of the mailbox and free/busy co-existence, but G Suite and Office 365 will handle the mail routing. The post below will cover how to setup mail routing assuming that mail is still being delivered to G Suite and the mail boxes are being migrated to Office 365.

Use this KB from Microsoft to learn about Criteria Based Routing in EOP

https://technet.microsoft.com/en-CA/library/exchange-online-mail-flow.aspx

BitTitan has a great article on how to setup Criteria Based Routing for a migration scenario.

https://community.bittitan.com/kb/Pages/How%20to%20set%20up%20mail%20routing%20on%20Office365%20when%20migrating%20users%20in%20batches.aspx

G Suite Setup
SMTP Domain Type Mail Routing (MX Points Here)
contoso.com Primary Domain YES

There are no domains to be setup for G Suite. We use the primary domain already added and verified in G Suite

Office 365 (Exchange Online)
SMTP Domain Type Mail Routing (MX Points Here)
contoso.com Primary Domain NO – G Suite
tenantid.onmicrosoft.com Tenant Domain YES

External Email Delivery


Mail Routing – New/Reply from Office 365 (Internal and External)


Mail Routing – New/Reply from G Suite (Internal and External)


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