Email

MX Lookup

Find the mail servers responsible for a domain.

Enter a bare domain name, such as example.com. The lookup runs from the FKINFAST server against public DNS — not from your browser — and the result is not stored.

Results appear here. Enter a domain name, then select Look up MX records.

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  • DNS records (A/AAAA)
  • Nameservers (NS)
  • Mail servers (MX)
  • SPF record and policy
  • DMARC record and policy
  • DKIM record (common selectors)
  • HTTPS availability
  • HTTP to HTTPS redirect
  • TLS certificate (issuer, validity, expiry)
  • Security headers (HSTS, CSP…)
  • CAA records
  • robots.txt availability
  • sitemap.xml availability
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How the MX lookup works

  1. Enter a bare domain name, such as example.com, and submit the form.
  2. The FKINFAST server queries the domain's MX records through a public resolver — the same lookup mail servers perform before delivering email.
  3. The result lists every mail exchanger with its priority, plus a PASS, WARNING, FAIL or UNKNOWN classification.

The lookup runs from FKINFAST's server, not from your browser. The domain you enter is not stored and the result is not linked to you.

Result states

PASS
One or more MX records were found, so the domain declares where its email should be delivered.
WARNING
The domain exists but publishes no MX records, so it may not receive email — unless it only sends mail.
FAIL
No records were found for this domain at all — it may not exist or may have no DNS at the moment.
UNKNOWN
The lookup could not be completed: it timed out or the public resolver failed.

Page-level errors are separate from these results. A validation error, rate limit, busy response, unavailable service or network failure is shown as an error, not as a FAIL result.

Input rules and limits

  • Enter a bare domain name, not a URL or an email address.
  • Wildcards and IP addresses are rejected.
  • Queries run against a public DNS resolver, never against the FKINFAST network.
  • MX priorities are shown exactly as published: lower numbers are tried first.
  • A single record of "0 ." (null MX) declares that the domain receives no email at all.
  • Limited to 30 lookups per 60 seconds per client IP.

What the lookup does not do

The lookup reads MX records only. It does not connect to the listed mail servers, does not verify mailbox addresses and does not test whether email actually arrives. DNS answers are cached briefly to keep results fast.

MX lookup FAQ

What does the priority number mean?

When a domain has several mail servers, sending systems try the lowest priority number first and fall back to the others if the first is unreachable. Multiple servers with the same priority are tried in an unspecified order.

What if my domain has no MX records?

A domain without MX records cannot receive email at its own name. If you only send email from it (for example a no-reply domain), that is fine; otherwise add MX records at your DNS provider.

What is a null MX record?

An MX record with the value 0 . (a single dot) is a deliberate declaration that the domain accepts no email. It is a valid configuration for send-only domains.

I just changed my records — why is the old one still shown?

DNS changes take time to spread, and the lookup may also serve a briefly cached answer. If your provider shows the new record elsewhere, wait a few minutes and retry.

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