MX Record Checker
Look up your MX records and check mail server health. Verify priority configuration, test connectivity, and check TLS support.
What are MX records?
MX (Mail Exchange) records are DNS records that tell the world which servers handle email for your domain. When someone sends you an email, their mail server queries your MX records to find out where to deliver it.
Each MX record has a priority (lower number = higher priority) and a hostname pointing to the mail server. Most domains have multiple MX records for redundancy — if the primary server is down, email is delivered to the backup.
Security risks
No TLS encryption
Your mail server's TLS certificate expired 2 weeks ago. Every email since has been transmitted in plaintext — readable by anyone on the network path.
MX pointing to decommissioned server
You migrated to a new mail provider but left the old MX record. Email is being delivered to a server you no longer control — or bouncing entirely.
Frequently asked questions
MX records tell sending servers where to deliver email for your domain. They include a priority (lower = preferred) and a hostname. Multiple MX records provide redundancy.
Lower numbers mean higher priority. A server with priority 10 is tried before priority 20. Same-priority servers receive load-balanced traffic.
Without STARTTLS, email between servers is transmitted in plaintext. Anyone intercepting the traffic can read the contents. STARTTLS encrypts the connection.
Without MX records, sending servers fall back to the A record. This usually means email bounces. Always configure proper MX records for reliable delivery.
Want ongoing monitoring?
Checking once is a start. But email authentication breaks silently over time. Get alerted the moment something changes.
Free plan includes 1 domain. No credit card required.