What is DNS? MX RECORD explained

[subornaakter20]

2018-06-14(Updated: 2024-12-28 )
Email Delivery BasicsIT knowledge

Before you can start sending email , you need to set up the DNS RECORD settings .

If these settings are not configured correctly, the reliability (reputation) of the sending server may decrease, and the delivery rate of emails may also decrease.

So this time I would like to explain "How DNS manufacturing email list works" and " A RECORD", "MX RECORD", and "TXT RECORD" which are closely related to email delivery!



Regarding DNS, each company has its own management department and administrators.

This could be the information systems department, the business management department, or a systems-related outsourcing company.

Before you start sending email, be sure to check with the DNS management department/administrator.



Table of Contents [Hide]

1. What is DNS?
2. How DNS Works
3. Relationship between DNS and Email Delivery
3.1. A RECORD (A record/Address record)
3.2. MX RECORD (Mail Exchange Record)
3.3. TXT RECORD
4. Summary
What is DNS?
"DNS" is an abbreviation for Domain Name System, and is the "server where information about domains is stored . "

For more information on "Domains", please see the following article:


What is a domain? Everything you need to know about its components and how it relates to email delivery
"Domains" are important in email delivery. Do you know what role they play? This time, we will introduce "What is a domain?" for IT beginners.
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To put it simply, the "IP address" (a string of numbers such as 182.236.93.187) is used by computers to represent addresses on the Internet for web servers, mail servers, PCs, etc., while the "domain" (a string of characters such as arara.com or arara.co.jp) is used by humans and is visible to humans.

The information linking these two is stored in the DNS (server), and the conversion is performed by the DNS. This conversion process is called "name resolution."

[How DNS works①]





If the settings linking the IP address and domain are not done correctly, you will obviously not be able to perform tasks using the domain (such as browsing websites or sending and receiving emails).