MX Record Lookup
Query authoritative MX (Mail Exchanger) records for any domain to identify email server priority and routing path configurations.
This interactive client-side tool is part of the NervLink Cybersecurity Suite. All analysis is verified entirely inside the local browser sandbox for maximum safety and data privacy compliance.
How It Works
- Input a target domain name.
- The tool queries authoritative DNS name servers for MX (Mail Exchanger) records via secure resolver proxies.
- Mail servers, prioritizations, and raw resolver metadata are formatted and returned.
Primary Use Cases
- Verifying mail routing settings for corporate domains.
- Troubleshooting email delivery failures.
- Reconnaissance of mail service provider tenancy.
Common Security Pitfalls
- Assuming email delivery works immediately after updating MX records (DNS propagation can take up to 24-48 hours).
- Setting identical priority numbers on multiple MX records without load-balanced servers.
Frequently Asked Questions
- What does MX priority mean?
- MX priority determines the order in which mail servers should be attempted. Lower values indicate higher priority, with the lowest-valued server being tried first.
- Can a domain have no MX records?
- Yes, if no MX record is present, mail delivery systems will attempt to deliver email to the domain's A record IP address directly as a fallback.
References & Standards