MX Lookup
Look up the MX records for any domain. See the mail servers and their priorities, check for redundancy, and identify the email provider. Free, no signup.
Mail servers
Lists every MX host that accepts mail for the domain.
Priorities
Shows the preference value of each server - lower numbers are tried first.
Redundancy
Flags single-server setups with no backup MX to receive mail during an outage.
Provider
Recognises common hosts (Google Workspace, Microsoft 365, Proofpoint…) from the MX names.
MX FAQ
What is an MX record?
An MX (Mail Exchange) record tells other mail servers where to deliver email for your domain. Each record has a hostname and a priority value.
What does MX priority mean?
Senders try the lowest priority number first. Equal values share load; higher values act as backups if the primary is unreachable.
Related email tools
This is one check. A full scan runs them all.
FreeThe MX Lookup covers one area. A full scan runs every check on the same site in one go, so nothing it does not reach goes unnoticed.
Covered by this check
- MX record lookup
- Mail server priorities
- Redundancy check
- Provider identification
Added by a full scan
- SPF, DKIM & DMARC analysis
- MTA-STS, TLS-RPT & BIMI checks
- DNS security (DNSSEC, CAA)
- SSL/TLS certificate validation
- Security headers analysis
- Domain reputation analysis
- Misconfiguration detection
- Continuous monitoring & alerts
Want it checked automatically? A free account rescans one site every week and emails you new findings. No credit card.
Start free monitoringMore email and DNS tools
DNS Lookup
Look up A, AAAA, MX, TXT, NS and other DNS records for any domain.
SPF Checker
Check an existing SPF record for errors and lookup limits.
DMARC Checker
Validate an existing DMARC record and see how it is configured.
DKIM Checker
Verify your DKIM selector and public key.
Email Security Checker
Run SPF, DKIM and DMARC checks together in one report.