MX Record Lookup
List a domain's MX records with priority, resolved IPs and SMTP reachability.
About this tool
MX (Mail Exchanger) records tell the world which servers accept email for your domain, and in what order of preference (lower priority value = tried first). This tool lists every MX record, resolves each hostname to its IP addresses, and tests whether the server answers on SMTP port 25.
Check MX records after switching email providers, when mail to your domain bounces, or to confirm a backup MX is configured. A domain with no MX records falls back to its A record for mail delivery, which is rarely what you want.
Frequently asked questions
What does MX priority mean?
Sending servers try the MX host with the lowest priority number first, and only fall back to higher numbers if it is unreachable. Equal priorities are used round-robin for load sharing.
Can an MX record point to an IP address?
No. The MX target must be a hostname with its own A/AAAA record, and it must not point to a CNAME. MX records pointing directly at IPs violate the standard and break with many mail servers.
Why does SMTP reachability show as blocked?
The connection test runs from this server, and some networks block outbound port 25. A timeout here does not always mean your mail server is down — verify with the SMTP Diagnostics tool or from another network if in doubt.