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What are MX records and how are they used?


An MX record is a publicly available address for an email recipients mail server. When someone, for sends an email to, the sender’s mail transfer agent looks up the available MX record at public DNS registry of to determine where to deliver emails.

A domain/ sub-domain cannot have multiple MX records. However, they can have multiple hosts associated with an MX record organized by priority.


MX record is mandatory to avoid failing anti-virus checkers against the registered domain/sub domain for this service. The MX record is also needed for “reply” tracking. The “reply to” address allows a recipient to respond back to an email. When a marketing / transactional email is replied to, the mail transfer agent looks up DNS entries to determine the MX record of the recipient’s mail server.