MX (Mail Exchange) records are DNS records that specify the mail servers responsible for accepting email messages on behalf of a domain name. They are essential for email delivery. When someone sends an email to a domain, the sending mail server queries the DNS for the MX records of the recipient's domain. These records indicate which servers should receive the email. MX records include a preference value (priority), allowing administrators to specify backup mail servers in case the primary server is unavailable. Lower preference values indicate higher priority.
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