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MX (Mail Exchanger) Record:

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 (Name Servers) Record:

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.

SOA (Start of Authority) 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.

CNAME (Canonical Name) Record:

Short for canonical name, also referred to as a CNAME record, a record in a DNS database that indicates the true, or canonical, host name of a computer that its aliases are associated with.

TXT / SPF (Sender Policy Framework) Record:

The SPF record defines one or more tests to carry out to verify the sender.

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