MX (Mail Exchange) records are a type of DNS (Domain Name System) record that are used to specify the servers that handle email messages for a particular domain. They are used to route email messages to the correct mail servers and are a crucial part of how email works on the internet.
Here's how MX records work:
When someone sends an email to an address at a particular domain, the sending mail server looks up the MX records for that domain to find out which server is responsible for handling email for that domain.
The sending mail server then connects to the server specified in the MX record and delivers the email to it.
The server specified in the MX record is responsible for delivering the email to the correct mailbox for the recipient.
MX records are usually stored in the DNS records for a domain and are managed by the domain's administrator. It is important to have correct and up-to-date MX records for a domain, as this ensures that email sent to addresses at that domain will be delivered correctly.