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The Domain Name System (DNS ) and its daemon named play a critical role in the delivery of email. In order to deliver email from one Web site to another, the server daemon will look up the remote Web site in the DNS to determine the host that will receive email for the destination. This process also occurs when email is sent from a remote host to your mail server.
DNS is responsible for mapping hostnames to IP addresses, as well as for storing information specific to email delivery, known as MX records. The Mail eXchanger (MX) record specifies which host, or hosts, will receive email for a particular domain. If you do not have an MX record for your hostname or domain, email will be delivered directly to your host provided you have an A record pointing your hostname to your IP address .
To view the MX records for a domain, use the command: host. For example: