What is MX/NS/SOA?
MX : Mail Exchanger
NS : Name Servers
SOA : Start of Authority Records
An
MX record or Mail exchanger record is a type of resource record in the
Domain Name System (DNS) specifying how Internet e-mail should be routed. MX records
point to the servers that should receive an e-mail, and their priority relative
to each other.
NS-records identify the DNS servers responsible (authoritative) for a zone.
The more important function of the NS-record is delegation. Every NS record is either
a delegation record or an authority Record. If the name of the NS record is the
name of the zone it appears in, it is an authority record. If the name of the NS
record is that of a descendant zone, then it is a delegation record.
The SOA is the first record in every properly configured zone. The
SOA record
contains information about the zone in a string of fields. The SOA record tells
the server to be authoritative for the zone.