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.
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What this 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.
Common MX Lookup errors
- 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 out of the box.
- Correct, redundant MX records
- SPF + DKIM + DMARC configured for you
- Migration with zero lost mail
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Frequently asked questions
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.