Email Tools

Mail Server Lookup

List a domain's mail servers with their IP addresses and reverse DNS names.

Not sure what to enter? Try an example: gmail.com

Free & instant No signup How to use FAQ

5 Server(s)

gmail.com

Priority	Hostname	IP Address	Reverse DNS
5	gmail-smtp-in.l.google.com	192.178.211.26	lcbomp-in-f26.1e100.net
10	alt1.gmail-smtp-in.l.google.com	173.194.41.26	mad01s14-in-f26.1e100.net
20	alt2.gmail-smtp-in.l.google.com	172.253.158.27	so-in-f27.1e100.net
30	alt3.gmail-smtp-in.l.google.com	108.177.125.27	tp-in-f27.1e100.net
40	alt4.gmail-smtp-in.l.google.com	192.178.230.26	yunrtab-in-f26.1e100.net

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5 mail server(s) found

Enter a domain to see each mail server it uses, in priority order, together with the server's IP address and reverse DNS hostname.

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Mail Server Lookup - gmail.com 0 seconds ago

How do I find a domain's mail servers?

A domain's mail servers are listed in its MX records. This lookup resolves each MX host name to its IP address and shows the reverse DNS (PTR) of those addresses, which is often how you can tell the email provider - Google Workspace, Microsoft 365, Zoho and so on.

How to look up mail servers

Enter the domain in the box above.
Click Look Up Mail Servers.
Read each mail server's host name, IP address and reverse DNS.
Check that every host resolves - an MX pointing to a name without an address causes bounced mail.

Related checks

To test whether the servers accept connections, use the SMTP Connectivity Checker.
For MX priorities, use the MX Record Checker.

JustChecker tracks your mail server configuration continuously.

Frequently Asked Questions

They reveal which provider really handles the mail and whether the servers are set up properly - receiving servers expect mail servers to have a matching reverse DNS name.

The hostnames tell you: google.com for Google Workspace, outlook.com for Microsoft 365, zoho for Zoho Mail, or your hosting company's name for hosting email.

The domain cannot receive email. If it should, add the MX records your email provider gives you.

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