MX Record Lookup
Find all MX records for any domain — mail servers and priority values. Essential for troubleshooting email delivery.
mx.sh
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What are MX Records?
MX (Mail Exchanger) records are DNS entries that specify which mail servers are responsible for accepting email on behalf of a domain. Every domain that receives email must have at least one MX record pointing to a mail server.
MX records include a priority value — lower numbers have higher priority. If the primary mail server (priority 10) is unavailable, email is delivered to the backup (priority 20) instead. This redundancy prevents email loss during server outages.
Common MX record patterns
- Google Workspace: aspmx.l.google.com (priority 1)
- Microsoft 365: domain-com.mail.protection.outlook.com
- ProtonMail: mail.protonmail.ch
- Zoho Mail: mx.zoho.com
Frequently Asked Questions
Enter your domain in the MX lookup tool above. You should see at least one MX record pointing to your email provider's mail server. If no MX records are returned, your domain cannot receive email. If you recently changed your MX records, allow up to 48 hours for DNS propagation.
Multiple MX records provide redundancy. If the mail server with the lowest priority number (highest priority) is unavailable, email is automatically routed to the next server. This is a best practice for ensuring email delivery uptime.
MX priority (also called preference value) determines which mail server is tried first. Lower numbers mean higher priority. Servers with the same priority value are chosen at random (load balancing). Priority 0 or 1 is the primary server; higher numbers are backups.