Posted On: Feb 22, 2018
The PTR record is basically used as a spam filter and is used to authenticate the incoming messages. An A record should always exist for the PTR records.
CNAME stands for Canonical Name, which is what this record provides to an alias name.
MX stands for Mail Exchanger and the MX record is a special type of resource record in the DNS (Domain Name System). It specifies a mail server, which is completely responsible for accepting the messages via email on behalf of the recipient’s domain. A preference value is used to prioritize the mail delivery in case of multiple servers.
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