What is MX record?

A DNS record that tells the internet which servers accept email for a domain.

Each MX record has a priority (lower is preferred) and a mail server hostname. A domain without MX records can still receive mail at its A record, but most providers treat missing MX as a warning sign.

A null MX ("0 .", RFC 7505) explicitly says the domain accepts no email.

Try it

• Email checker API

Related terms

• AAAA record: A DNS record that points a hostname to an IPv6 address.
• TXT record: A DNS record holding free text, used for SPF, DMARC, domain verification and more.
• CNAME record: A DNS alias that points one name at another name.