DNS

MX Record Lookup

Mail Servers

Resolve a domain's mail servers

We'll query authoritative nameservers and return every mail exchanger, ranked by priority.

DNS Resolver

Most domains return the same records on every resolver — the choice matters during DNS propagation, or when a filtering resolver blocks a domain.

Tool features

Comprehensive MX record analysis and email server validation
4 checks

MX Record Lookup

Find all mail exchange records for any domain

Email Security

Verify proper email server configuration

Priority Analysis

View mail server priority and routing

Export Options

Download results as CSV or copy to clipboard

What is an MX record & how it works

How domains route incoming email

MX (Mail Exchange) records tell other mail servers where to deliver email for your domain. Each record points to a mail-server hostname and carries a priority value — lower numbers are tried first, with higher ones acting as backups.

This lookup queries the domain's authoritative nameservers, lists every mail exchanger ranked by priority, and resolves each to its IP address so you can confirm your email routing is set up correctly.

MX Record
Points to the mail server responsible for receiving email for the domain.
Priority
Lower value = higher preference. Senders try the lowest-numbered server first.
Fallback
MX records with higher priority numbers act as backup mail servers.

How to use this tool

Check a domain's mail servers in four steps
1
Enter a domain
Type the domain whose mail servers you want to check, e.g. example.com.
2
Pick a resolver (optional)
Open Advanced Settings to query a specific public resolver such as Google (8.8.8.8) or Cloudflare (1.1.1.1).
3
Run the lookup
Click Check MX Records to query the authoritative nameservers for the domain's mail exchangers.
4
Review the results
Inspect each mail server, its priority and resolved IP, plus the diagnostics and recommendations for your email setup.

Related tools

Keep debugging with tools from the same suite
5 tools
TXT Lookup
Retrieve TXT records including SPF, DKIM, DMARC, and verification records
DNS Lookup
Perform DNS queries for A, AAAA, MX, TXT, CNAME, and other DNS record types
SPF Lookup
Check Sender Policy Framework (SPF) records for email authentication and mail server authorization
DMARC Lookup
Check DMARC policy records for email authentication, reporting, and policy enforcement
Email Health Checker
Comprehensive email deliverability check including SPF, DKIM, DMARC, and MX records

Frequently asked questions

Common questions about MX records
5 Q&A

An MX (Mail Exchange) record tells sending mail servers which host is responsible for receiving email for your domain.

Each MX record has a priority number. Senders try the lowest number first; higher numbers are used as fallbacks if the primary is unavailable.

Yes. Multiple MX records provide redundancy — if the highest-priority server is down, mail is delivered to the next one in line.

If you use a hosted email provider (Google Workspace, Microsoft 365, etc.), your MX records point to their servers so they can receive and process your mail.

Without MX records, some senders fall back to the domain's A record, but this is unreliable. Publish proper MX records to ensure delivery.