MX record lookup
Find a domain’s mail servers in priority order, with their IP addresses and provider, and check that email survived the move.
What this tool checks
DNSPeek looks up the MX records through public resolvers, then the A and AAAA records of every mail server and whether it is an alias. It names the provider for well-known services such as Google Workspace and Microsoft 365, and reads the domain’s SPF and DMARC records for a quick health check.
How to read the result
Mail servers are listed lowest priority number first: that is where senders deliver. Every server needs at least one public address. A missing SPF or DMARC record does not stop delivery, but makes your own messages more likely to land in spam.
What to check after a migration
Send a test message to the domain from an outside account and reply from it. If the website moved but email did not, make sure contact forms on the new server send through your mail provider or are listed in SPF: check that with the SPF checker. The migration playbook covers the rest.
Frequently asked questions
What is an MX record?
An MX (mail exchanger) record tells other mail servers where to deliver email for your domain. Each record has a priority: senders try the lowest number first and fall back to the others.
Does moving my website affect email?
Only if the DNS moves too. When you switch nameservers, the new DNS host must have the same MX records, or mail starts bouncing. If email stays with Google Workspace or Microsoft 365, copy their MX, SPF and DKIM records exactly.
Why is an MX pointing to a CNAME a problem?
The MX standard requires the target to be a real host name with its own A or AAAA record. Many senders cope with an alias, but some refuse it, so mail from them never arrives.
What is a null MX?
A single MX record “0 .” says the domain accepts no email at all (RFC 7505). It is right for domains that never receive mail, and wrong if you expect messages.
Moving a site to a new server?
See the site on the new server before you change DNS: DNSPeek gives you one HTTPS preview link that works on any device and that you can share with your team or client. No hosts file, no VPN.
Create a free preview link