Results update as you type and are explained line by line, so you can see exactly which rule failed. This is a syntax and structure check, not a mailbox-existence check: confirming that a mailbox actually receives mail requires sending a message. Clean addresses in bulk by pasting a list into the Remove Duplicate Lines tool first.
Calculator
How to use the Email Validator
- Type the email address you want to check.
- Read the verdict and the per-rule report.
- Fix any failed rule shown in the table.
- Use the suggestion if you mistyped a common domain.
About this tool
The Email Validator is built for speed and accuracy: every calculation runs in your browser, so your data never leaves your device and the result updates as you type. It works equally well on a phone, a tablet or a desktop, and it is free to use as many times as you like.
Common use cases
- Checking a signup form before submission.
- Validating a mailing list before an import.
- Catching typos in customer email addresses.
- Teaching email address structure.
Tips for the best result
- Use the latest figures you have - even a small change in rate or term can shift the outcome by hundreds.
- For annual figures, divide by 12 to get a monthly number you can compare with the result.
- Bookmark this page and revisit the calculation as the inputs change.
Frequently asked questions
Does this verify the mailbox exists?
No. Only the format, domain shape and common typos are checked. Deliverability can only be confirmed by sending mail.
Are new TLDs such as .xyz accepted?
Yes, any top-level domain of two or more letters passes, including newer gTLDs.
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