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A client currently has emails such as:

they have these two A records (among others, to different IPs):

pointing to the same IP address.

There is only one mx record - -->

I believe they are on an exchange at the moment, whether that makes any difference.

I am to transfer control of mail to our own server, which is not an exchange. Is this task as simple as:

creating a subdomain

and pointing the A records to the IP of the new mail server?

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Change/update the MX record to point to the new email host (which should be an existing A record in your DNS zone).

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