What is MX Lookup?
MX Lookup provides a direct lookup against a domain's authoritative name server to list MX records in priority order, with changes appearing instantly for accurate diagnostics. The tool connects to mail servers to verify reverse DNS records, perform Open Relay checks, and measure response time performance to identify potential email delivery problems.
Users can check each MX record's IP address against 105 DNS-based blacklists (RBLs/DNSBLs) to ensure email deliverability and maintain sender reputation. This comprehensive approach helps system administrators and email professionals troubleshoot and optimize email infrastructure efficiently.
Features
- MX Record Lookup: Lists MX records for domains in priority order with instant updates
- Email Server Diagnostics: Connects to mail servers to verify reverse DNS and perform Open Relay checks
- Performance Measurement: Measures response time performance of mail servers
- Blacklist Checking: Tests MX record IP addresses against 105 DNS-based blacklists (RBLs/DNSBLs)
Use Cases
- Troubleshooting email delivery failures
- Verifying MX record configurations for domains
- Checking mail servers against DNS blacklists
- Measuring email server response time performance
- Identifying open relay vulnerabilities in mail servers
