none
Hybrid Exchange MX records

    Question

  • Would like to know where does the MX records point to ..in an hybrid exchange deployment.
    Thursday, October 20, 2016 5:22 AM

Answers

  • This is totally depends upon you how you want to route your incoming emails..

    If you want mail flow to come to O365 and then route to your on-premises then you can configure your mx point to O365.

    If you want all incoming email comes directly to your on-premises and then go to O365 then you can point to your on-premise gateway server.

    But to get better filter feature would suggest to route through O365.


    Mihir Nayak If a post is helpful, please take a second to vote

    Thursday, October 20, 2016 6:04 AM
  • There is no such best practice but yes only think if mail route through your internal gateway how good is the filtering part with comparison to O365 EOP.

    While changing the MX record best to do it doing off hours, it all depends upon how long it reflect the changes for MX.

    Yes for Exchange Hybrid configuration, you can simple google it you will get best step-by-step guide from technet how to do it.

    Example :

    https://blogs.technet.microsoft.com/canitpro/2016/05/09/step-by-step-configuring-a-hybrid-office-365-deployment-via-hybrid-deployment-wizard/

    Hope this helps


    Mihir Nayak If a post is helpful, please take a second to vote


    Thursday, October 20, 2016 6:31 AM

All replies

  • This is totally depends upon you how you want to route your incoming emails..

    If you want mail flow to come to O365 and then route to your on-premises then you can configure your mx point to O365.

    If you want all incoming email comes directly to your on-premises and then go to O365 then you can point to your on-premise gateway server.

    But to get better filter feature would suggest to route through O365.


    Mihir Nayak If a post is helpful, please take a second to vote

    Thursday, October 20, 2016 6:04 AM
  • If you want your inbound mail to go through Office 365, then look in the Office 365 Portal, Domains, and it'll tell you the format of your MX record for that.

    Ed Crowley MVP "There are seldom good technological solutions to behavioral problems."
    Celebrating 20 years of providing Exchange peer support!

    Thursday, October 20, 2016 6:18 AM
    Moderator
  • Thanks for the reply Mihir.

    Is there a best practice? We have around 200 Mailbox.

    Is there any service interruption while running Exchange Hybrid Wizard? Any Blog that I can refer for setting up Hybrid Exchange. We have an working Tenant with license and AD sync functional! Thanks

    Thursday, October 20, 2016 6:21 AM
  • There is no such best practice but yes only think if mail route through your internal gateway how good is the filtering part with comparison to O365 EOP.

    While changing the MX record best to do it doing off hours, it all depends upon how long it reflect the changes for MX.

    Yes for Exchange Hybrid configuration, you can simple google it you will get best step-by-step guide from technet how to do it.

    Example :

    https://blogs.technet.microsoft.com/canitpro/2016/05/09/step-by-step-configuring-a-hybrid-office-365-deployment-via-hybrid-deployment-wizard/

    Hope this helps


    Mihir Nayak If a post is helpful, please take a second to vote


    Thursday, October 20, 2016 6:31 AM
  • Different thoughts...

    1.  Move it right away so you can take advantage of EOP protection.

    2.  Move it when you've moved half your mailboxes to the cloud so mail goes first to the place where most mailboxes live.

    3.  Never move it if you prefer your existing SMTP hygiene server or appliance over EOP.

    4.  Something else based on whatever is important to you.


    Ed Crowley MVP "There are seldom good technological solutions to behavioral problems."
    Celebrating 20 years of providing Exchange peer support!

    Thursday, October 20, 2016 6:49 AM
    Moderator
  • I don't know of any compelling reason to change the MX during off-hours.  But before testing it make sure that mail flows properly by testing thoroughly.

    Ed Crowley MVP "There are seldom good technological solutions to behavioral problems."
    Celebrating 20 years of providing Exchange peer support!

    Thursday, October 20, 2016 6:49 AM
    Moderator
  • It depends on:

    • What your migration goals are (all mailboxes in-cloud, most mailboxes in-cloud, split 50/50, most mailboxes on-premises)
    • Optionally, how far you are in your migration
    • If you are currently using a 3rd-party message hygiene filter that you want to replace with EOP or EOP/ATP

    If, like most organizations, your goal is to transition all (or most) of your mailboxes to Office 365, I'd recommend moving your MX record to Office 365 once you pass the 50% of mailboxes migrated standpoint, to minimize the amount of unnecessary hops that mail takes to reach its final destination.

    As long as you have HCW completed successfully and TLS mail flow between the organizations, it can be moved at any time.  If you want to replace your existing messaging hygiene solution, you can move it right away to remove the dependency on your 3rd-party solution.

    Regards,

    Aaron

    Friday, October 28, 2016 7:53 PM