MS exchange internal and external dns

Admin ICBaku 1 Reputation point


I have a question for public and private domain. We use same domain name internally and externally like Currently I want to setup an exchange 2016 server in my environment. Will I have problems if I register, with my domain provider and create MX and A records on my internal dns server without changing the internal domain name.

I don't want to rename domain name because I have more than 100 clients on the domain controller right now.

I need help who has encountered this issue.

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  1. Thameur-BOURBITA 32,596 Reputation points


    It should works without problem. In case the external and internal DNS zone use the same DNS name , when client want resolve a external DNS entry it's not possible because it will look only in internal DNS zone and the internal DNS server will not forward the request to external DNS because there is a internal DNS zone with same name. Therefore any DNS record created in external DNS zone should be also created in internal DNS zone to let internal server resolve them.

    Please don't forget to mark helpful reply as answer

    1 person found this answer helpful.

  2. Gary Reynolds 9,396 Reputation points

    Hi AdminICBaku-7393,

    Yes you can configure DNS without the need to rename the domain. Have a look at this article which provides some background on split-brain configurations.

    The article explains how to use DNS policies to configure split-brain DNS on your Windows 2016 servers, and avoid some of the common issues with split-brain configuration.


    1 person found this answer helpful.

  3. Kael Yao-MSFT 37,576 Reputation points Microsoft Vendor

    Hi @Admin ICBaku

    According to the post, I suppose and would be used as SMTP domains.
    For example, you are going to use, as mailbox addresses without affecting Active Directory.

    If I misunderstood it, please feel free to correct me.

    To me there is no need to add MX or A records for these domains on your internal DNS server.
    But you may need to add these records in public DNS to make mail flow and client access from external work.

    On Exchange server you also need to add these domains as accepted domain to receive emails sent to these domains.
    To use these domains as mailbox email addresses, you can configure an email address policy.

    More information can be found in this link: Configure Exchange to accept mail for multiple authoritative domains

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