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MX Lookup

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About MX Lookup

This test lists MX records for a domain in priority order, queried directly against the domain's authoritative name server — changes show up instantly. Cross-checked against SPF, DKIM, DMARC, BIMI, MTA-STS, and TLS-RPT in the same scan so you see the full email security posture, not just MX.

How the MX lookup works

Live DNS query, in your browser

01

Enter the domain

Any domain — yours or someone else's. We query DNS, not the domain itself, so no notification is sent.

02

We query authoritative servers

Browser-side DNS-over-HTTPS query against Google + Cloudflare resolvers for fast, accurate results.

03

You see records in priority order

Every MX record with its priority + hostname. Plus SPF, DMARC, DKIM cross-check so you catch related issues.

Common MX errors this catches

What an MX checker actually surfaces

No MX records at all

Domain has zero MX records. Email cannot be delivered. Usually means DNS was wiped or never configured for email.

MX records pointing to the wrong provider

Domain still routes to old GoDaddy/Bluehost servers after a Microsoft 365 / Google Workspace migration. Causes silent email loss.

Single point of failure (one MX record)

Only one MX record means no failover. If that server goes down, mail bounces. Best practice: 2+ records at different priorities.

CNAME used instead of MX

RFC violation. Some receivers will reject the domain. Switch to a proper A or AAAA-record target.

Reverse DNS (PTR) missing on mail server IPs

Many spam filters block servers without valid rDNS. Causes deliverability hits even when MX is correct.

Pointing to an IP address instead of hostname

MX records must point to a hostname, not an IP. Some receivers reject mail from misconfigured MX entirely.

FAQ

MX lookup — common questions

What is an MX record?+
An MX (Mail eXchange) record is a DNS record that tells the internet which mail servers are responsible for accepting email for your domain. Without a valid MX record, no one can send email to your domain — messages bounce immediately.
How do I read an MX lookup result?+
Each MX record has two values: a priority (a number like 10 or 20 — lower numbers are tried first) and a hostname (like mail.example.com). Most domains have 1–4 MX records pointing to their email provider. Multiple MX records of the same priority share load; different priorities are used for failover.
Why are my MX records not showing up?+
If our MX lookup returns no records, your domain has no MX records configured. This means email cannot be delivered to that domain. Most commonly this happens when DNS was just changed (wait up to 48 hours for propagation), when MX records were deleted accidentally, or when the domain is not configured for email at all.
How is your MX lookup different from MXToolbox or dig?+
Our MX lookup queries authoritative name servers directly (same as dig / nslookup) but in your browser — no command line needed. We also cross-check SPF, DKIM, DMARC, BIMI, MTA-STS, and TLS-RPT in the same scan so you see the full email security posture, not just MX.
Are MX records case-sensitive?+
No. DNS records are case-insensitive. mail.example.com and MAIL.EXAMPLE.COM resolve to the same record. Priority values must be integers (10, 20, 30 — not "low" or "high").

Single-protocol tools

Need just one protocol?

SPF Checker →
Validate Sender Policy Framework
DMARC Checker →
Verify DMARC policy + reports
DKIM Checker →
Inspect DKIM signing keys
Full email security scan →
All 7 checks in one report

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