MX Lookup
Check MX, SPF and DMARC DNS records for any domain — verify your mail servers are set up correctly.
MX Lookup finds every MX record (mail server) with its priority. Shows each MX hostname, its A record, IP, reverse DNS. Critical for mail delivery diagnostics: without MX — mail cannot be delivered; wrong priority — wrong server is picked.
Why teams trust us
How it works
Enter domain
Query MX DNS records
Get servers and IPs
What are MX Records?
MX (Mail Exchanger) records specify which server receives email for a domain. When there are email problems, MX records and their priorities are the first thing to check.
All MX Records
Complete list of MX servers with priorities and TTL.
Server A Records
Resolve MX hostnames to IP addresses for the full picture.
SPF Compatibility
Check if MX servers are included in the domain's SPF record.
Real DNS Query
Direct query to authoritative DNS without caching.
Who uses this
Email marketers
deliverability diagnostics
Sysadmins
mail server setup
Developers
email API integration
DevOps
post-mail migration check
Common Mistakes
Best Practices
Monitor MX records automatically
DNS monitor notifies when your domain MX records change.
Sign up freeWhat are MX, SPF and DMARC?
MX (Mail Exchanger) is a DNS record that specifies the mail servers responsible for accepting emails for a domain. SPF (Sender Policy Framework) is a TXT record that lists authorized sending IP addresses. DMARC (Domain-based Message Authentication) defines the policy for handling emails that fail SPF or DKIM checks.
Learn more
Related guides
Longer-form reading on this topic from the knowledge base.
Automate this check
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