MX

A DNS record that specifies the mail servers and their priority order for a domain.

In plain words

An MX record tells mail servers where to deliver email for your domain.

Practical example

The MX record for example.com points to mx.yandex.net with priority 10 — all mail goes there.

Where you encounter it

When setting up email on a domain: Yandex 360, Google Workspace, Mailgun, and other providers.