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Check which mail servers handle email for any domain. See priorities, identify providers, and verify DNS configuration.
Enter a domain to look up its MX records and identify the email provider.
MX (Mail Exchange) records are DNS records that specify which mail servers are responsible for receiving email on behalf of a domain. Each MX record includes a priority value and a hostname pointing to the mail server. When someone sends an email to your domain, their mail server looks up your MX records to find where to deliver the message.
MX priority values (also called preference values) determine the order in which mail servers are tried. Lower numbers indicate higher priority. Mail is attempted to the lowest priority server first. If that server is unavailable, the sending server falls back to the next lowest priority server. For example, a server with priority 10 is tried before one with priority 20.
MX record hostnames reveal which email service handles mail for a domain. For example, hostnames containing google.com or googlemail.com indicate Google Workspace, outlook.com indicates Microsoft 365, and zoho.com indicates Zoho Mail. This tool automatically identifies the provider for each MX record.
Without valid MX records, email sent to your domain will fail to deliver. MX records are fundamental to email routing — they tell other mail servers where to deliver messages addressed to your domain. Misconfigured or missing MX records can cause lost emails, bounced messages, and communication failures.
Unboxd reads every email and gives you a daily briefing with only what matters.