No you will not need it before you install Exchange but in order to receive email from outside of your organization, you will need to register a domain and create various DNS records to facilitate inbound email delivery to your users. You will need an A record for the host receiving email and then also an MX record for this A record. The MX (mail exchanger) record is critical so that other mail servers can find your inbound mail server. You can use your ISP’s DNS for all services.
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