Enter a domain to see its mail servers, who provides its email, and whether SPF and DMARC are in place. Free, instant, no signup.
A free MX record lookup. Enter a domain and it queries DNS for the domain's mail servers (MX records) in priority order, names the email provider when it recognises one, such as Google Workspace or Microsoft 365, and checks whether SPF and DMARC are published. No signup, no email.
MX records tell the internet which servers accept email for a domain. If they are missing or wrong, mail to the domain bounces or disappears, so they are the first thing to check when email stops arriving.
SPF and DMARC are separate records that help receivers trust mail from the domain. For a full deliverability check, including DKIM, use the Email Deliverability Checker.
Enter the domain above, for example example.com. The tool queries DNS and lists the mail servers with their priorities. The lowest number is tried first.
The MX hostnames show it. Google Workspace uses aspmx.l.google.com style names, and Microsoft 365 uses names ending in mail.protection.outlook.com. The tool names the provider when it recognises the pattern.
A lower number means a higher preference. Senders try the lowest priority first and fall back to the next one if it does not answer.
