MX Record Checker
Look up MX records for any domain. Detect email provider, check SMTP status, and view mail server configuration.
Features
Complete MX record analysis for any domain
MX Record Lookup
Retrieve all MX records with priorities sorted from highest to lowest priority.
Provider Detection
Automatically identify the email provider (Google, Microsoft, Zoho, etc.) from MX hostnames.
IP Resolution
Resolve each MX hostname to its IP address for network-level analysis.
SMTP Check
Test if the primary mail server is reachable on port 25 with a 5-second TCP connect test.
How It Works
Enter Domain
Type any domain name to look up its mail exchange records.
DNS Query
We query MX records, resolve IPs, detect the email provider, and test SMTP connectivity.
View Results
See all MX records with priority, hostname, IP, provider, and SMTP reachability status.
Frequently Asked Questions
MX (Mail Exchange) records are DNS records that specify which mail servers are responsible for receiving email for a domain. Each MX record has a priority value - lower numbers indicate higher priority. When sending an email, the sender's mail server queries the recipient's MX records to find where to deliver the message.
MX priority (or preference) determines the order in which mail servers are tried. A server with priority 10 is tried before one with priority 20. If the primary server is unavailable, email is delivered to the next server in priority order, providing redundancy.
Many cloud providers and ISPs block outbound port 25 to prevent spam. The mail server may still be fully functional - it could be behind a firewall, load balancer, or proxy that filters connections. A blocked port 25 from our test does not necessarily mean the server cannot receive email.
Yes, and it is recommended. Multiple MX records with different priorities provide redundancy. If the primary mail server is down, email will be delivered to backup servers automatically. Most email providers configure multiple MX records by default.