Forum Discussion
Route internal mail through on prem and external through O365
We have a customer who has a Hybrid O365 environment. All mailboxes are still on-premises. Due to frequent power outages we need to migrate their email to the cloud. The problem with this is t...
need A bit more information on the setup. But if your onprem is still hosting the mailboxes unless you have some kind of connector forcing all mail out the internal mail will route onprem by default.
To satisfy if your talking about inbound mail coming in and routing to 365 then you need to setup 365 as backup mx record so it routes there when you are down. Then when you come back online the queued yo messages can deliver via connector.
Other factors are unknown here as what does security scanning of messages? If that’s in 365 then all your inbound and possibly outbound email should be going there regardless. But internal mail should just route internal by default.
To satisfy if your talking about inbound mail coming in and routing to 365 then you need to setup 365 as backup mx record so it routes there when you are down. Then when you come back online the queued yo messages can deliver via connector.
Other factors are unknown here as what does security scanning of messages? If that’s in 365 then all your inbound and possibly outbound email should be going there regardless. But internal mail should just route internal by default.
Thanks Christopher, I have amended the opening post to hopefully clarify some details.