List a domain's mail servers (MX records) in priority order with their IP addresses.
How to use MX Lookup
Enter the domain part of an email address, such as gmail.com for name@gmail.com.
Click Find mail servers.
Check the priorities and hosts. Lower numbers are tried first, and the detected provider is shown when recognized.
Worked example
An MX lookup for a company moving to Google Workspace should show smtp.google.com (or the older aspmx.l.google.com servers). If the previous host still appears, mail is still going to the old provider.
What is an MX record?
A mail exchanger record names a server that accepts email for the domain, with a priority number. Senders try the lowest number first.
What does a null MX mean?
An MX record pointing to “.” declares that the domain does not accept email at all.
Put this guide into practice
MX Lookup — List a domain's mail servers (MX records) in priority order with their IP addresses.