MX Lookup
Find mail servers (MX records) and their priority for any domain.
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