Windows DNS MX record not resolving

Prakash Modak 91 Reputation points


we recently migrated mail service to M365, this works perfectly file with users.

The issue we are facing while resolving MX record in local DNS is, it resolves to local name server instade of

i've added mx record in local DNS

DNS SERVER> Forward Lookup Zones>>>>> same as parent - mx - 10



Windows DHCP
Windows DHCP
Windows: A family of Microsoft operating systems that run across personal computers, tablets, laptops, phones, internet of things devices, self-contained mixed reality headsets, large collaboration screens, and other devices.DHCP: Dynamic Host Configuration Protocol (DHCP). A communications protocol that lets network administrators manage centrally and automate the assignment of Internet Protocol (IP) addresses in an organization's network.
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  1. Philippe Levesque 5,706 Reputation points


    Try ipconfig /flushdns to reset the computer DNS cache. Make sure the computer request the MX record from the correct DNS server you updated too.

    Can I ask if it cause issue ? I ask as if it's only your local network it mean that MX is technicaly not used at all, unless you have a third part mail server inside your LAN that could use it. (which I will doubth if you are on O365 already)

    The MX entry is used only when a server send an email. The computer that are in sync with 0365 send via Outlook(MAPI) to the remote MS server, which handle the send somewhere else, or in the same tenant.

    The important MX is for the external domain, thus where everyone else business check to send you an email.