MX Check
Looks up MX records for a domain and tests SMTP connectivity to each mail server. Confirms that the domain can receive email and that its mail servers are reachable from the public internet.
Frequently asked questions
- What does MX stand for?
- Mail eXchanger — DNS records that point to a domain's mail servers in priority order. When someone emails you, their server looks up your MX records to find where to deliver.
- Why check SMTP connectivity?
- An MX record can point to a hostname that is unreachable (firewall, wrong IP, expired DNS). This tool connects to each server and verifies it actually accepts mail.
- My MX is set but I am not receiving email. Why?
- Check that reverse DNS matches the MX hostname, SPF allows the sending IP, and TLS is valid. Gmail and Outlook reject mail from servers that fail any of these.