Check any domain's mail servers in one click. See its MX records, their priority order, and whether the domain can receive email at all.
Every domain that can receive email publishes one or more MX (Mail Exchange) records in its DNS. This tool reads those records live and shows you each mail server and its priority, lowest first. If a domain returns no MX records, it is not set up to receive mail, and addresses there will bounce.
An MX lookup is the first checkpoint in email verification, but it only tells you the domain can receive mail, not whether a specific mailbox exists. To confirm the actual inbox is real, our email verification API performs a live SMTP check on top of the MX lookup.
An MX (Mail Exchange) record is a DNS entry that tells the internet which mail servers are responsible for receiving email for a domain. Each record has a priority, and senders try the lowest-priority server first. Without a valid MX record, a domain cannot receive email.
Enter the domain above and the tool queries its live DNS and lists every MX record with its priority and hostname. It is read-only and instant, and works for any public domain.
If a domain returns no MX records, it is not configured to receive email, so any address at that domain will almost certainly bounce. That is a strong early signal that the addresses are undeliverable.
Checking MX is the first step of real verification: if the domain cannot receive mail at all, nothing else matters. Our full 16-point engine goes further, performing a live SMTP check to confirm the individual mailbox exists, not just the domain.
Yes, this MX lookup is completely free with no signup. When you need to confirm that the mailboxes themselves are real, not just the domain, that is what the email verification API does.
More free tools: email format checker, disposable email checker. Ready to verify mailboxes? Get 100 free credits.