MX Record

MX records are used to define the mail exchanges that are used for the domain. This helps email messages arrive at your mail server correctly.

A and AAAA Records

Both of these records map a host to an IP address. The “A” record is used to map a host to an IPv4 IP address, while “AAAA” records are used to map a host to an IPv6 address.

SOA Record

The Start of Authority, or SOA, record is a mandatory record in all zone files. It must be the first real record in a file (although $ORIGIN or $TTL specifications may appear above). It is also one of the most complex to understand.