Frequently Asked Questions
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4. What are MX records and how do I change them?
There are two things to change in order to use the mail address user@domain.com: adding the MX (Mail Exchange) record of your domain to the DNS (Domain Name Service) database, and adding the domain name to the mail server's configuration file so that it doesn't reject mail messages addressed to user@domain.com.
The MX record is simply an entry in your DNS table that controls where email is sent for the domain name.
The mapping from the name of a domain or a host to an IP address is done by DNS.
Each mapping from a name to an IP address is called a record. There are several types of records, the most popular of which is the A record; this is the host name to an IP address mapping. Another type is called the MX record, short for Mail Exchange. When the mail server program processes an email message, it first looks for this record of the destination address. In other words, the mail program first tries to resolve the MX record, not the A record.
In the master DNS database file, add an MX record for the domain you want to receive the email. You can add just one line, as in the following:
MX 10 mailhost
The above example specifies that the host with the name mailhost is designated to receive all the mail addressed to this domain. If the domain name is mydomain.com, any mail message with the address user@mydomain.com will now be delivered to:
user@mailhost.mydomain.com
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