MX Lookup
Find mail servers (MX records) and their priority for any domain.
Ready when you are
Enter a value above and hit Run check to see results here.
About the MX Lookup Tool
The MX Lookup tool returns the mail exchange servers responsible for accepting email for a domain, along with their priority values. Every domain that receives email publishes one or more MX records at its DNS. When another mail server wants to deliver a message to `user@yourdomain.com`, it looks up the MX record, sorts by priority (lower number = higher priority) and connects to the first reachable host on port 25.
MX Lookup is the fastest way to confirm which mail platform actually handles a domain — Google Workspace, Microsoft 365, Zoho, Fastmail, Proton Mail, a self-hosted Postfix, or a spam-filtering gateway such as Mimecast, Proofpoint or Barracuda. When users complain that email isn't arriving, an MX check usually surfaces the problem in seconds: wrong host, missing failover MX, MX pointing at an A record instead of a hostname, or CNAME pointed where an MX should be.
Combined with our SPF, DKIM, DMARC and BIMI checkers, MX Lookup gives you a complete picture of a domain's email posture — inbound routing, outbound authentication and brand indicators. If you're onboarding a new tenant, migrating between providers or debugging a bounce, start here.
How to use this tool
- 1Enter the required value in the input field above (domain, IP, URL, or text depending on the tool).
- 2Click the action button to run the check — results are computed instantly from our edge network.
- 3Review the parsed output, key fields and any warnings shown in the result card.
- 4Copy the result, share the page URL, or jump to a related tool from the sidebar to continue debugging.
Key features
- All MX records with priority values, sorted
- Detects common misconfigurations (CNAME at MX, priority ties)
- Confirms mail platform (Google, Microsoft 365, spam filter etc.)
- Pairs with SPF, DKIM, DMARC checkers for full email audit