MX Lookup Tool
Check mail exchange records for any domain
MX (Mail Exchange) records specify the mail servers responsible for accepting a domain.
Domain Lookup
Enter a domain name to check its MX records and mail server configuration
Popular MX Lookups
Explore commonly searched public email domains on EmailToolBox. Click a domain to run an instant MX lookup.
gmail.com
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outlook.com
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yahoo.com
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icloud.com
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protonmail.com
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zoho.com
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aol.com
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yandex.com
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qq.com
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163.com
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hotmail.com
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gmx.com
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Only public email providers are listed; no private domains are displayed to protect user privacy.
What are MX Records?
MX (Mail Exchange) records are DNS records that specify the mail servers responsible for accepting email messages on behalf of a domain. They are essential for email delivery and must be properly configured for your domain to receive emails.
Key Components:
- Priority: Lower numbers indicate higher priority mail servers
- Mail Server: The hostname of the mail server (must be a fully qualified domain name)
- TTL: Time To Live - how long the record should be cached
How MX Records Work:
- When someone sends an email to your domain, their mail server looks up your MX records
- The sending server tries to deliver to the highest priority (lowest number) server first
- If the primary server is unavailable, it tries the next priority server
- This process continues until the email is delivered or all servers fail
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