A mail exchanger record (MX record) specifies the mail server responsible for accepting email messages on behalf of a domain name. It is a resource record in the Domain Name System (DNS). It is possible to configure several MX records, typically pointing to an array of mail servers for load balancing and redundancy.
The Domain Name System (DNS) is the phonebook of the Internet. When users type domain names such as ‘google.com’ or ‘nytimes.com’ into web browsers, DNS is responsible for finding the correct IP address for those sites. Browsers then use those addresses to communicate with origin servers or CDN edge servers to access website information. This all happens thanks to DNS servers: machines dedicated to answering DNS queries.
One of the best network diagnosing tools that combines the power of ping and traceroute.MTR Tool
dig is a network administration command-line tool for querying the Domain Name System. MyIPTools created a User Interface of dig to simplify DNS querying for all users.Use dig
A DNS pointer record (PTR for short) provides the domain name associated with an IP addressPTR Lookup