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How do I configure and test the MX Record for my Internet Domain name?

When you want to run your own mail server, and it does not matter what version and make of mail server you're using - as long as the mail server is using SMTP as the e-mail transfer mechanism - you'll need to configure the MX Records for your domain.

MX is an acronym for Mail eXchange. MX is defined in RFC 1035. It specifies the name and relative preference of mail servers for the zone. MX is a DNS record used to define the host(s) willing to accept mail for a given domain. I.e. an MX record indicates which computer is responsible for handling the mail for a particular domain.

Without proper MX Records for your domain, only internal e-mail will be delivered to your users. External e-mail from other mail servers in the world will not be able to reach your server simply because these foreign servers cannot tell to which server they need to "talk" (or open a connection to) in order to send the mail destined for that domain.

You can have multiple MX records for a single domain name, ranked in preference order. If a host has three MX records, a mailer will try to deliver to all three before queuing the mail.

MX Records must be in the following format:

domain.com.    IN    MX   10     mail.domain.com.

The Preference field is relative to any other MX Record for the zone and can be on any value between 0 and 65535. Low values are more preferred. The preferred value is usually 10 but this is just a convention, not a thumb rule. Any number of MX Records may be defined. If the host is in the domain it requires an A Record. MX Records do not need to point to a host in the same zone, i.e. an MX Record can. point to an A Record that is listed in any zone on that DNS or any other DNS server.

 


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