MX Record Checker — Check Email DNS in Seconds
An MX record check tells you whether a domain has mail servers configured. If there's no MX record, the domain cannot receive email — period.
What Mailbeam checks
Every verification runs 7 checks in parallel and returns a structured result in under 100ms.
Instant MX record lookup
Query the MX records for any domain and see the mail servers, priority values, and TTL in seconds.
Part of full email verification
MX checking is one of 7 checks in every Mailbeam verification — combined with SMTP, disposable detection, and more.
No signup required
Use the free tool to look up MX records for any domain without creating an account.
Detects missing or broken MX
If a domain has no MX records, or records that point to non-existent hosts, Mailbeam flags this immediately.
API access
The MX check result is returned as part of every verification response. No separate endpoint needed.
Catch-all detection
Beyond MX records, Mailbeam identifies domains where the mail server accepts all emails regardless of mailbox existence.
How it works
Extract the domain
From the email address or domain you enter, Mailbeam extracts the domain part (after the @).
DNS query
A DNS MX record query is sent to authoritative name servers for the domain.
Record analysis
The returned MX records are analyzed for validity, priority order, and host resolution.
Result returned
The check result (pass / fail / unknown) is returned alongside the full verification results and score.
When to use it
Debugging email delivery
If emails to a domain are bouncing, an MX check confirms whether the domain's mail infrastructure is properly configured.
Validating new contacts
Before adding a contact to your CRM or sending a first email, verify that their domain has mail servers.
Pre-send domain validation
For bulk campaigns, an MX pre-check can eliminate entire classes of invalid domains before SMTP-level validation.
Developer testing
Use the free tool during development to debug email configurations for your own domains or those of third-party services.
Frequently asked questions
Ready to integrate?
Free tier includes 1,000 verifications/month. No credit card required.