DNS Tools
MX Record Lookup
Look up a domain's MX records to see which mail servers handle its email.
Enter a domain to look up its MX records and see which mail servers handle its email.
JustChecker tracks your DNS records continuously and alerts you the moment something changes.
Frequently Asked Questions
An MX ("Mail Exchange") record tells other mail servers which server is responsible for receiving email on behalf of your domain - it's the record that makes yourname@yourdomain.com actually deliverable.
Multiple MX records provide redundancy - the lowest priority number is tried first, and if that mail server is unreachable, sending servers automatically fall back to the next-lowest priority record instead of the message simply failing.
It means the domain cannot receive email at all, regardless of whether a website is running on it - a common oversight for domains registered primarily for a website, where email was never separately configured.
Yes, and this is extremely common - your A/AAAA records control where your website is served from, while your MX records independently control where email is delivered, completely decoupled from your web hosting.
MX records are required by the DNS specification to point to a hostname (which itself then resolves via an A/AAAA record), never directly to an IP address - this is a fixed rule of how MX records work, not a configuration choice.
MX changes are subject to the same DNS propagation delay as any other record, governed by the record's TTL - sending mail servers may continue delivering to the old provider until their own cached copy of your MX record expires.
No - MX records only control mail routing/delivery destination. Authentication and anti-spoofing protection are handled by separate DNS records (SPF, DKIM, DMARC), checked by this project's dedicated email-security tools.
Most domains only need one or two - a primary mail server and, optionally, a backup with a higher priority number. A very long list of MX records is unusual outside of large enterprise mail routing setups.