Email Address Checker
Check email address format and the reachability of the domain and MX records
Features
Two-step verification: format and DNS
Dual confirmation of RFC-compliant format and domain existence via DNS
MX records displayed by priority
View mail server priority and names in a list
Batch verify up to 10 addresses
Judge multiple addresses together at once, separated by line breaks, spaces, or commas
Check results by category
Format, domain, and MX records displayed individually in accordion view
How to Use
Enter email address
Enter up to 10 addresses to check in the input field, separated by line breaks, spaces, or commas
Click the check button
Each address is verified through DNS MX record lookup
Review details in accordion
Expand and view format, domain, and MX records for each email
Copy the addresses confirmed reachable
The "Copy reachable addresses" button lets you copy only the addresses that passed the format, domain, and MX checks all at once
Use Cases
Organize email distribution lists
Extract only reachable addresses before broadcasts or mass mailings
Pre-check account registration
Check whether the domain of the entered address is configured to receive mail
Before sending business email
Check recipient domain MX configuration before sending important inquiries
Clean up old customer lists
Identify invalid addresses in contact lists that haven't been used in a long time
Safety and Privacy
Server-side processing
Processed temporarily on the server and discarded after the result is returned. Only the information needed for the lookup is sent.
Temporary processing only
For Email address verification, temporary processing occurs on the server, then data is discarded after results are returned.
Communications encrypted with HTTPS
All sent and received data is encrypted by TLS and cannot be read by third parties.
No transmission to third parties
Input content is not sent to external services such as ad networks or trackers.
Transmission to DNS servers only
For MX record inquiries, only target domain information is sent to external DNS servers.
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