Understanding MX records
When someone emails you@example.com, the sending server looks up example.com's MX records to find where to deliver the message. Each record lists a mail server and a priority; servers try the lowest priority first and fall back to higher ones.
What to check
- That MX records exist and point to the right provider.
- That priorities are sensible (one clear primary).
- That email authentication is set up, so verify SPF & DMARC too.
Related tools
Run a full DNS lookup for other record types, or a reverse DNSon a mail server's IP.
Frequently asked questions
What is an MX record?
An MX (Mail eXchange) record tells other mail servers where to deliver email for a domain. Each MX record points to a mail server hostname and has a priority, and lower numbers are tried first.
What does the MX priority mean?
When a domain lists multiple mail servers, the priority (preference) value decides order: the lowest number is the primary, higher numbers are backups used if the primary is unavailable.
Why does a domain have no MX records?
It may not receive email, or it uses the A record as a fallback. Domains that use Google Workspace, Microsoft 365 or other providers will show that provider's mail servers here.
How do MX records relate to SPF and DMARC?
MX controls where mail is delivered; SPF and DMARC (stored as TXT records) control who is allowed to send mail as your domain. Check those with our SPF & DMARC tool.