How it works
- 1
Enter a domain name
Type or paste any domain — no need for http:// or www. The tool strips them automatically.
- 2
DNS queries run via DoH
MX and TXT records are fetched from Cloudflare's DNS-over-HTTPS API — fast, accurate, and DNSSEC-aware.
- 3
See mail servers and SPF
Mail server priority, hostnames, TTL, email provider detection, and SPF record status — all in one view.
MX Record Lookup
Look up MX records for any domain, identify the email provider, and check SPF.
Queries Cloudflare DNS-over-HTTPS — your domain name is sent to Cloudflare to resolve (same as a normal DNS query). 0/20 free today
🛡️ Verify zero uploads — open DevTools → Network tab
Open your browser's DevTools (F12), go to the Network tab, and use this tool. You will see zero outbound requests — all processing runs inside your browser sandbox via WebAssembly or pure JavaScript. Nothing you paste or upload is ever sent anywhere.
Use cases
Verify email routing after migration
After migrating from one email provider to another, confirm the new MX records have propagated globally.
Diagnose email delivery failures
If mail to a domain is bouncing, check whether valid MX records exist and are pointing to the right servers.
Pre-sales domain research
Quickly identify which email platform a prospect or partner uses before a call — useful context for IT and sales.
Frequently Asked Questions
What does the MX record priority number mean?
Lower priority numbers are preferred. Mail is delivered to the lowest-priority (numerically smallest) MX server first. If that server is unavailable, the next-lowest priority is tried. Most providers use 1, 5, or 10 for primary servers.
Why do some domains have multiple MX records?
Multiple MX records provide redundancy. If the primary mail server (lowest priority number) is unavailable, sending servers retry the next MX record. Google Workspace uses 5 MX records at different priority levels for this reason.
How long does MX record propagation take?
DNS changes propagate based on the TTL (Time-to-Live) of the old record. Most providers use TTLs of 300–3600 seconds (5 minutes to 1 hour). Full global propagation can take up to 48 hours for very high TTL records.
What is SPF and why does it appear here?
SPF (Sender Policy Framework) is a TXT record that specifies which mail servers are authorised to send email on behalf of your domain. It's closely related to MX because both control email delivery. Without SPF, spoofed email from your domain may be accepted.
Does this tool show real-time DNS data?
Yes. Queries go to Cloudflare's DNS resolver (1.1.1.1) via DNS-over-HTTPS, which returns authoritative data. Results reflect the current state of DNS — not a cached snapshot from our servers.
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Official specifications & references
RFC 5321 — Simple Mail Transfer Protocol
The SMTP standard — defines how MX records are used to route email.
RFC 7208 — Sender Policy Framework (SPF)
Defines SPF TXT record syntax, mechanisms, qualifiers, and the 10-lookup limit.
Cloudflare DNS-over-HTTPS
Documentation for the Cloudflare DoH API used to power this tool.
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