DNS Tools
MX Lookup
Look up a domain's mail servers and the priority order mail is delivered to them in.
How it works
This tool queries the domain's MX records directly over DNS and sorts them by priority. These are the same records any mail server checks before it can deliver mail to that domain.
FAQ
- What is an MX record?
- It tells other mail servers which server(s) handle email for a domain, and what order to try them in. Without at least one MX record, a domain generally can't receive any email.
- What does the priority number mean?
- Lower numbers are preferred. A sending server tries the lowest-priority (most preferred) mail server first. It only tries higher numbers if that one is unreachable. Think of it as a preference order, not a strict ranking of importance.
- What's a "null MX"?
- It's a single MX record that points to "." (RFC 7505). This means the domain owner is explicitly saying "this domain accepts no email at all," rather than simply forgetting to set one up.
- Why do I see no MX records for a domain I know sends email?
- Some providers can send mail from a domain that can't itself receive any mail. Sending and receiving are set up independently. A missing MX record only means the domain can't receive mail. It says nothing about whether it can send mail.