MX Record Lookup & Explainer
Enter a domain. The tool returns the MX records, the priority of each, the resolving IP for each, and the mail provider behind them (Google Workspace, Microsoft 365, Fastmail, etc.).
- Priority: lower number = higher priority. 10 is the typical primary.
- Multiple MX: redundancy. Backup MX only receives if primary is down.
- One MX pointing at an A record: misconfiguration. MX hostnames should resolve to A records but the MX value itself must be a hostname, not an IP.
- No MX: some servers fall back to the A record for delivery, most don't. Always set MX.
Live DNS lookup. Heuristic provider detection from MX hostname patterns. Flags common misconfigurations (no MX, single MX with no fallback, MX pointing at A record).
Inbound deliverability troubleshooting. Sales prospecting: knowing whether a prospect runs Google Workspace or Microsoft 365 changes how Outlook-specific or Gmail-specific features matter.
FAQ
Why do most domains have multiple MX records?+
Redundancy. Lower-priority MX (higher numeric value) only receives if the primary is down. Most providers ship 4–5 MX servers across regions.
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Articles, glossary entries, and other tools on the same topic.
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