MX Lookup
Look up the MX (mail exchanger) records for a domain.
MX records control where your email goes. One wrong change kills delivery.
Monitor MX records around the clock
- ✓Continuous MX monitoring
- ✓Instant change alerts
- ✓SPF / DKIM / DMARC checks
- ✓Email + Slack notifications
- ✓Change history log
- ✓Deliverability score
Frequently Asked Questions
What is an MX record?
An MX (Mail Exchanger) record specifies which servers receive email for a domain. When sending to user@example.com, the sending server looks up MX records for example.com and connects to the highest-priority host to deliver the message.
What does the MX priority number mean?
Lower priority values are preferred — MX 10 mail1.example.com is tried before MX 20 mail2.example.com. Multiple records with the same value are tried in random order (load balancing). Most providers use 10 as primary and higher values as backups.
Can a domain have no MX records?
Yes — if no MX records exist, senders may fall back to the domain's A record per RFC 5321. Some domains publish MX 0 . (null MX per RFC 7505) to explicitly declare they don't accept email and prevent fallback delivery attempts.
Why do I see different MX records from different locations?
During DNS propagation, different nameservers may serve different values. GeoDNS services may also return different records based on resolver location. Use our DNS Propagation tool to check consistency across global resolvers.