Reverse MX lookup for mail infrastructure

Find domains that share mail exchanger hosts and understand email routing relationships.

reverse MX lookupMX lookupmail infrastructureemail routing

When to use it

Reverse MX lookup is useful when investigating email infrastructure, hosted mail migrations, deliverability issues, or domains that rely on the same mail service.

What it shows

The query compares MX records and returns domains that share mail exchanger hosts. It can reveal use of Google Workspace, Microsoft 365, custom mail gateways, or shared filtering infrastructure.

How to use the result

Treat shared MX as an infrastructure relationship. Confirm ownership separately with domain records, web content, certificates, and account-level evidence.

More SharkDNS Guides

What is DNS lookup used for?

Use DNS lookup to inspect records, verify routing, troubleshoot mail, and compare public DNS visibility.

Reverse IP lookup explained

Find domains observed on the same IPv4 address and understand shared hosting or infrastructure relationships.

Subdomain discovery for asset inventory

Use public subdomain data to build a cleaner domain inventory and find exposed hosts.