# Mail Exchanger record (MX)

*Internet standard*. A DNS record that maps the hostname in a domain that accepts email for the domain.

The `MX` records associated with a domain routes email over the [Simple Mail Transfer Protocol][smtp] (SMTP).

## Related entries

* [Canonical Name record (CNAME)][cname]
* [Domain Name System (DNS)][dns]
* [Fully Qualified Domain Name][fqdn]
* [Simple Mail Transfer Protocol][smtp]

[smtp]: /docs/sendgrid/glossary/smtp/

[cname]: /docs/sendgrid/glossary/cname

[dns]: /docs/sendgrid/glossary/dns

[fqdn]: /docs/sendgrid/glossary/fqdn