What does validating mx record mean

Posted by / 25-Aug-2020 21:03

What does validating mx record mean

If you’re new to DNS, we recommend that you read DNS basics.

DNS provides a mapping between human-readable computer hostnames and the IP addresses used by networking equipment.In the near future, Office 365 will reject email from unknown senders that are relayed from on-premises servers.This means that if the sender or recipient domain of a message doesn’t belong to your organization, Office 365 will reject the message unless you have created a connector to allow this behavior.Office 365 uses domains, like contoso.com, to route email messages.When you set up email in Office 365, you typically switch from the default domain that you got when you first signed up for Office 365 (the domain ending with .onmicrosoft.com) to your organization’s domain.

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Most organizations want Office 365 to manage all their mailboxes and filtering, and some organizations need more complex mail flow setups to make sure that they comply with specific regulatory or business needs.