Free MX lookup · Instant · No signup

MX Lookup

Look up the MX records for any domain. Domain Doctor shows your mail servers and priorities and flags missing, unreachable, or misconfigured MX.

19 checks per scan Results in seconds Free, no signup

The tool

What the MX Lookup checks

MX (Mail Exchange) records tell the internet where to deliver your email. Each record has a priority, lower numbers are tried first, and points to a mail server hostname that must itself resolve to an IP.

Domain Doctor lists your MX records in priority order, confirms each hostname resolves, and detects a null MX (RFC 7505) that declares your domain sends no mail. Missing or broken MX means inbound email simply bounces.

How it works

Check your domain in three steps

1Enter your domainType any domain into the box above and start the free scan. No signup, no software.

2We inspect it liveDomain Doctor looks up your MX records and resolves each mail server, in real time from our servers.

3Get a clear verdictYou get a plain-language result, the exact records we found, and a concrete fix if anything is wrong.

What to watch for

Common MX Lookup problems

No MX record, so inbound email cannot be delivered
MX hostname that does not resolve to an IP
MX pointing to an IP address instead of a hostname (invalid)
Duplicate priorities causing unpredictable routing
Leftover MX from an old provider after migration

VASTROX Business Email

Reliable mail delivery on VASTROX Email

Move to VASTROX business email with correctly configured MX, redundancy, and full authentication built in.

Correct, redundant MX records
SPF, DKIM and DMARC configured for you
Migration with no lost mail

Get VASTROX Email Talk to VASTROX about email

Hosting, VPS, business email and game servers. Free migration. Real support.

Questions

Frequently asked

What does MX priority mean?

Lower numbers are higher priority and tried first. Equal priorities are load-balanced. A typical setup lists a primary at 10 and a backup at 20.

Do I need an MX record if I don’t use email?

If your domain never receives mail, a null MX record (priority 0, target ".") explicitly declares that, which reduces backscatter and spoofing.