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Help, configuration
and tips.
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Tutorial:
Setting Up Your Domain and DNS
This page explains how to set up
your DNS and so ensure your incoming mail can reach you.
DNS
and IP's
With
most domain purchases, the registrar usually offers a DNS service in with the
package. With this DNS you can usually control the IP of which the domain converts
to and also create multiple sub-domains (code-crafters.com is the domain name,
www.code-crafters.com is a sub-domain, mail.code-crafters.com is another sub-domain...
etc.). Each of these sub-domains can also usually have its own set DNS information
(such as the IP, MX records... etc.), which can be useful for load sharing and
backup facilities.
MX
Records
This is the information stored on DNS which controls and
directs incoming mail to the correct mail server. To make sure emails for your
domain are directed to your computer, you must set the MX records to contain the
host address of your mail server. If required, you can set more than one MX record
and prioritize them accordingly. For example you could use:
mail.yourdomain.com
- priority 5 (primary server)
mail2.yourdomain.com - priority 10 (secondary
server)
mail.someotherdomain.com - priority 15 (ternary server)
The lowest priority value
is used first and if this doesn't respond then the next lowest value is used.
This continues until either one of the hosts has responded or all of them have
failed. This system allows you to run backup servers or even share the load with
multiple mail servers.
