DNS
MX record
Mail Exchange record. A DNS record specifying the mail server responsible for receiving email for a domain.
Definition
An MX (Mail Exchange) record is a DNS record that specifies which mail server is responsible for receiving email on behalf of a domain. MX records include a priority value - lower numbers indicate higher priority. When sending email, the sender's server queries MX records to determine where to deliver the message. An MX that names a host with no address breaks delivery to that host. A domain with no MX records at all falls back to its own A or AAAA address (an "implicit MX"), and a null MX (a single record pointing at ".") says the domain accepts no mail.
Examples
example.com MX 10 mail.example.comexample.com MX 20 mail2.example.com (backup)
Check your own domain
The free MX lookup lists the mail servers your domain publishes, live from public DNS, in the order senders try them, with the IPv4 and IPv6 addresses and provider of up to ten of them. It explains a null MX, an implicit MX, an MX that points at an alias or an IP address, and a host that does not resolve.
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