MailTester Ninja is a free email verifier that checks whether any email address is real and able to receive mail, in real time, with no account to create. Paste an address, get an instant result, and see exactly why it is deliverable or not.
Unlike most tools, our free email verifier stores nothing. Every address is checked live in memory and discarded immediately, so your data never sits on our servers.
Verify an email address for free now.
How to verify an email for free
- Type or paste the email address you want to check.
- MailTester Ninja runs a live check in a second or two.
- You get a clear verdict: valid, invalid, catch-all, or risky, with the reason behind it.
No signup, no credit card, no software to install.
What our free email verifier checks
- Syntax and format against the RFC standards.
- Domain and MX records, to confirm the domain can receive mail.
- A live SMTP check that confirms the mailbox exists, without sending an email.
- Catch-all, role and disposable detection, so you know how much to trust each result.
Free plan and when to upgrade
The free email verifier is perfect for checking addresses one by one. When you need to clean a whole list or plug verification into your own product, our paid plans cover bulk verification and the email verification API, starting at $6.99 a week with a daily rate model and no hidden credits.
Why verify your emails
Sending to dead addresses raises your bounce rate and damages your sender reputation, which sends more of your mail to spam. A quick check with a free email verifier keeps your list clean, your inbox placement high and your costs down.
More free tools
Beyond the verifier, use the email finder to discover a professional address from a name and a domain, learn more about how email verification works, or read the email verifier guide.
Free email verifier FAQ
Is the email verifier really free?
Yes. You can verify email addresses for free with no signup. Paid plans only add bulk verification and API access.
Do I need to create an account?
No. The free email verifier works instantly in your browser, with no account and no card.
Does it send an email to the address?
No. We confirm the mailbox exists through a live SMTP conversation with the recipient server, without delivering any message.
Do you keep the addresses I check?
Never. Every address is verified in memory and discarded straight away. We keep aggregate data only.