Exchange
The hostname of a server that can accept mail for the domain. It is not an IP address.
Free DNS tool
MX Checker
Find a domain’s mail exchangers and their priorities.
Understand the lookup
What this checker is really showing
MX records tell sending mail servers where to deliver messages addressed to a domain. This checker lists the published mail exchangers and sorts them by preference.
Illustrative DNS record
example.com MX 10 mail.example.comA useful way to check
- 1Enter the domain after the @ in an email address.
- 2Compare the returned hostnames with the MX values supplied by your mail provider.
- 3Review priority numbers and check that your intended hosts have working address records.
Read the result
Details worth noticing
Priority
A lower number is preferred. Equal numbers can share traffic; backup exchangers often have higher values.
Null MX
A single MX pointing to a dot indicates that the domain does not accept email.
Before you change a record
- An MX record does not prove that a specific mailbox exists.
- No MX record is not conclusive proof that mail is impossible; SMTP can fall back to an address record.
- A configured exchange may still refuse connections or recipients.
Quick answers
Does the lowest priority number mean fastest delivery?
No. It tells senders which exchange to try first, not how quickly that server will respond.
Why does a dot appear as my MX target?
That is a null MX declaration. It tells other mail systems the domain is not intended to receive messages.