>I have a DNS related question. What is the difference between an A record
>and an MX record on a DNS server?
An A record gives the IP address(es) for a host name.
An MX record gives the host name(s) that accept mail for the domain.
So you should have one A record for each host on the domain that should be
reachable by the Internet, and one MX record for each mail server you
have. For example:
example.com. MX 10 mail.example.com
example.com. MX 20 mail2.example.com
mail.example.com. A 192.168.10.1
mail2.example.com. A 192.168.10.2
The first 2 MX records show that your mailservers are mail.example.com
(with a preference value of 10), and mail2.example.com (with a preference
value of 20). mail.example.com will be used first since it has a lower
preference value.
The second two MX records give the IP address for the host names of the
mail servers. Note that the MX record can NOT be an IP address, so you
need the A records.
-Scott
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