MX Record Lookup

See every MX record for a domain, sorted by priority, with IPv4/IPv6 resolution and mail-provider identification.

Why MX records matter

The MX record is the entry point for every email sent to your domain. When a sender's mail server wants to deliver a message to user@yourdomain.com, it queries DNS for the domain's MX records and connects to the lowest-priority host that answers. If your MX records are wrong, missing, or point to a dead server, mail bounces immediately.

Priority ordering

Lower number = higher priority. Senders try priority 10 before priority 20, and only fall back if the higher-priority host is unreachable. Many setups use a single MX with priority 10 for primary delivery and a secondary at 20 as backup.

Provider identification

The MX hostname usually tells you which mail platform a domain uses. *.protection.outlook.com = Microsoft 365. *.google.com = Google Workspace. *.zoho.com = Zoho Mail. This is useful for outreach (knowing the recipient's tooling) and for troubleshooting (different platforms have different deliverability quirks).