Can 365 ignore internal domains when routing email?

Question

Hi all,&nbsp;This is a conundrum I've got concerning Users accessing 365 services whose email is provided by Google/G Suite. We currently have two primary groups of users.&nbsp;Group A Users have their emails hosted by Office 365.Group B Users have their emails hosted by G Suite.&nbsp;Group A can currently access all service just fine as all services, including Email. If Group B is set up in the same manner as the above with the exception of email, any email sent internally between Group A and Group B fails as it is assumed that Group B's email is hosted by 365, and so doesn't reach them. Any email sent from any other domain, i.e. Yahoo, to Group B works perfectly.&nbsp;I hope the above makes sense. I would appreciate any advice regarding this.&nbsp;Thanks!

jcgonzalezmartin · Answer

Which platform is the master in terms of e-mail: Google or Office 365? I guess Google, if so you have to have both Group of users in Google and configure e-mail redirection for the Group of users that is already in Office 365

patrick thomas · Answer

Hi Juan,&nbsp;Thanks for the response.&nbsp;We're in between at the moment. Group A needs&nbsp;the benefits of being on&nbsp;Office 365, whilst B need the benefits of being on Google. Not the ideal situation to be in, but we're&nbsp;caught at the moment. It boils down to education needs.&nbsp;From what you're saying though it sounds like it can't be done. I would have thought there was some way we could force Office 365 to ignore internal accounts for email routing. So as it stands you have to have email hosted - not just the account - with 365 in order for the other Office 365 services to be accessed?&nbsp;I'm not making a lot of sense myself when reading it back, but I hope someone can decipher what I'm saying!&nbsp;Thanks again,

vasilmichev · Answer

You will need to setup the so-called "simple domain sharing", as detailed for example here: https://support.office.com/en-us/article/domains-faq-1272bad0-4bd4-4796-8005-67d6fb3afc5a#bkmk_pilot
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In any case, you will need to configure some sort of forwarding to handle the flow. Depending on the setup you can either do "regular" user-level forwarding or set up connectors, etc.

patrick thomas · Answer

Hi Vasil,&nbsp;Sorry for the slow response.&nbsp;This looks promising, but I am still unsure this is what we&nbsp;will need to do. We spoke to Microsoft phone support and it was advised the proposed&nbsp;setup we want&nbsp;is not going to work, or at least reliably so, to do&nbsp;what we want to do.&nbsp;I think&nbsp;we'll need to rethink.&nbsp;Thanks both,

nestori syynimaa · Answer

Hi Patrick,&nbsp;If I understood correctly from your previous posts, your MX records points to Google and you forward mail from there to Office 365. If so, all you need to do is to go to Exchange Online admin center,&nbsp;go to mail flow and change to accepted domains tab. Then double-click the domain in question and change&nbsp;This accepted domain is to&nbsp;Internal Relay and click save. You will get a warning about missing outbound connector, but because your MX points to Google, that is not an issue.&nbsp;That should do it, let us know whether it worked.

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Can 365 ignore internal domains when routing email?

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