MX Record Lookup
List the mail servers that receive email for a domain, in the order senders try them.
Frequently asked questions
What is an MX record?
An MX (mail exchanger) record names the server that accepts email for a domain. Without one, most senders fall back to the domain's A record, so a missing MX is a common cause of lost mail.
What does MX priority mean?
Senders try the server with the lowest number first and move to higher numbers only if it is unreachable. Servers with equal priority share the load.
Can an MX record point to an IP address or a CNAME?
No. An MX must point to a host name that has its own A or AAAA record. Pointing to an IP address or to a CNAME is invalid and some servers will refuse to deliver.
What is a null MX?
A single MX record with the target "." (RFC 7505) says the domain accepts no email at all. It lets senders fail fast instead of retrying for days.
Why do my MX records show no IP address?
The mail server name has no A or AAAA record, so nothing can connect to it. Fix it at the DNS host of the mail server's domain.
How long until MX changes take effect?
Up to the record's TTL, because resolvers cache it. This tool queries public DNS directly, so it shows what a sender would see now. Use the DNS propagation checker to compare resolvers worldwide.