How It Works
Perform mail exchange diagnostic checks in four steps
Enter Domain
Enter your domain name (e.g. gmail.com) into the lookup search bar.
Lookup MX Records
Our server queries DNS authority servers in real time to locate active MX exchanges.
Resolve IPs
We attempt to resolve IPv4 (A) and IPv6 (AAAA) addresses for all discovered mail servers.
Run Diagnostics
Get detailed priorities breakdown, formatting alerts, and validation checks.
Query Domain MX Records
Enter your domain name below to resolve incoming mail server exchanges and prioritize configurations.
Why Use Our MX Lookup Tool?
The most robust and complete tool to verify and debug your domain's incoming mail routing servers.
Real-time DNS Resolution
Directly query authoritative DNS servers to fetch and present the most accurate and fresh MX records published on your domain.
Hostname IP Resolution
We automatically lookup both IPv4 (A) and IPv6 (AAAA) records for every listed mail exchanger to ensure they route to active hosts.
Redundancy Verification
Our analyzer checks priority structures and redundancy settings to warn you about potential single points of failure in your mail flow.
Trusted by Sysadmins & Email Engineers
What professionals say about our mail exchange checker
"This MX tool let me quickly check if our secondary mail servers had the right priority and were correctly resolving A records. Found the routing glitch instantly."
Marcus Aurel
IT Administrator
"The IP mapping detail is incredibly helpful when running audits. Showing both IPv4 and IPv6 hosts simplifies verifying client email configurations."
Laura Green
SEO Architect
"Clean, fast, and does what it says. Gives useful warnings about lack of redundancy if clients only configure one server."
Steve Rogers
System Engineer
Latest Articles & Guides
Expert tips to master MX records and email routing
What is an MX Record? DNS Mail Exchange Basics
Understand what Mail Exchange (MX) records are, how they point your domain's emails to mail servers, and how DNS priorities work.
How to Configure MX Records for G Suite or Google Workspace
Step-by-step guide to setting up your custom domain mail servers with Google Workspace to receive business emails correctly.
Common MX Record Errors and How to Troubleshoot Them
Learn how to diagnose deliverability warnings, lack of redundancy errors, and incorrect hostname setups in your DNS settings.
MX Record TTL: Why Time-To-Live Matters for Email Delivery
Understanding TTL for MX records is critical for email migrations. Learn how TTL affects failover speed, migration windows, and deliverability.
Frequently Asked Questions
An MX (Mail Exchange) record is a DNS resource record that specifies the mail servers responsible for accepting incoming email messages on behalf of a domain. It tells external senders where to deliver mail.
The priority determines the order in which mail servers should be contacted. Senders will contact the server with the lowest preference number first. If it is unreachable, they fallback to the server with the next lowest value.
No. Standard RFC specifications dictate that MX records must point to fully qualified hostnames, never to direct IP addresses. If you use raw IPs, external mail exchangers might reject incoming mail.
Having multiple MX records provides redundancy. If your primary mail server goes down due to maintenance or hosting issues, a secondary mail server can temporarily queue incoming emails until the primary server recovers.
DNS changes, including MX record modifications, can take anywhere from a few minutes to 48 hours to propagate globally, depending on the TTL (Time To Live) setting of the record.