MX Lookup
Look up the MX records for any domain. See the mail servers and their priorities, check for redundancy, and identify the email provider. Free, no signup.
Mail servers
Lists every MX host that accepts mail for the domain.
Priorities
Shows the preference value of each server - lower numbers are tried first.
Redundancy
Flags single-server setups with no backup MX to receive mail during an outage.
Provider
Recognises common hosts (Google Workspace, Microsoft 365, Proofpoint…) from the MX names.
MX FAQ
What is an MX record?
An MX (Mail Exchange) record tells other mail servers where to deliver email for your domain. Each record has a hostname and a priority value.
What does MX priority mean?
Senders try the lowest priority number first. Equal values share load; higher values act as backups if the primary is unreachable.
Related email tools
More email and DNS tools
DNS Lookup
Look up A, AAAA, MX, TXT, NS and other DNS records for any domain.
SPF Checker
Check an existing SPF record for errors and lookup limits.
DMARC Checker
Validate an existing DMARC record and see how it is configured.
DKIM Checker
Verify your DKIM selector and public key.
Email Security Checker
Run SPF, DKIM and DMARC checks together in one report.
This is one layer of the scan
FreeThis MX Lookup scan covers one category. A full scan adds the checks it does not reach: exposed secrets, malicious scripts, and supply chain risks in your third-party code.