If we do this request by using PowerShell, it could look like this: We also see the priority of the received lookup results as example 10. Therefore, if we take a look up for a domain like, possible result we will receive can be. In our example we talk about Exchange online. In the simplest case, a domain may have just one mail server. The set of MX records of a domain name specifies how email should be routed with SMTP. MX records (mail exchanger records) are type of certified and verified resource records in the DNS (Domain Name System) that specifies a mail server (like Exchange or Exchange online) responsible for accepting email messages on behalf of a recipient’s domain, and a preference value used to prioritize mail delivery if multiple mail servers are available. Note: I focus in this article the way by using EOP, there are also other solutions we could go with, specially using a hybrid Exchange environment. In this specific article I want to write about DNS records which are needed for the mail flow with Exchange online. If we want to use cloud services it is necessary to understand how DNS works.
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