MX/SMTP Check

Resolve MX records and test SMTP connectivity.

About MX/SMTP Check

This tool resolves your domain's MX records and attempts TCP/25 connections to the top-priority hosts to see if they respond. Use it to quickly diagnose misconfigurations, blocks, or connectivity problems.

For a comprehensive deliverability check, ensure SPF, DKIM, and DMARC are correctly configured. Firewalls or ISPs may block outbound SMTP; connection failures here don’t always indicate a server issue.

Illustration for MX/SMTP check