Free tool
Free email verifier. Find out if an address is real.
Need to verify in bulk or from your backend? Use the API
Trueguard Basic is free
Run the same check at scale.
Use it through the API to check signups, lead forms and email lists.
Create a free accountNo credit card required.
Verify an email address now.
10 free checks a day, no signup and no card. Nothing is sent to the address you check.
Or try
Fake signups
Throwaway and invalid addresses take a free-tier seat, then skew every conversion number you report.
Bounces
Above a 2% bounce rate mailbox providers throttle you. Above 5% you start landing in spam.
Dead leads
Role accounts and rotted addresses sit in the CRM looking like pipeline that will never answer.
How do I verify an email address?
Three steps, under a second, no message ever reaches the inbox.
Read the address
Resolve the mail servers
Ask the destination server
What does this email verifier check?
Seven layers in one answer. Each one has a dedicated page if you want to dig into it on its own.
Syntax
MX records
SMTP deliverability
Disposable
Catch-all
Role-based
Free-mail provider
What each result means.
Every answer, in plain English.
The mailbox exists, accepts mail, and nothing about the address raises a flag. Mail you send should land.
The address can receive mail, but it needs care: a throwaway domain, a full mailbox, a high-risk domain, or a catch-all we could not confirm.
The address cannot receive mail. The format is broken, the domain has no mail servers, or the server rejected the mailbox.
The mail server did not give a clear answer, usually because it blocks verification checks. It says nothing bad about the person.
Three quick definitions.
Email validator vs email verifier: same thing?
In practice, yes. Email verifier, email validator, email validation tool, and email checker all describe the same job: confirming an address can receive mail. Trueguard uses "verifier" for this free tool and "validation" for the paid API, but the underlying checks are identical.
What is a disposable email address?
A disposable email address is a temporary mailbox that exists for minutes or hours and self-destructs after that. Services like Mailinator, Guerrilla Mail, Temp-Mail, and 10MinuteMail let anyone receive a confirmation email without revealing a real identity. They're routinely used for free-tier farming, fake account creation, and bypassing email verification.
What is a catch-all email address?
A catch-all email address belongs to a domain that accepts mail for every possible mailbox. The real user's address and a random string of characters both get the same acceptance from the server. Because the server accepts everything, an SMTP probe cannot tell you whether the specific mailbox exists.
How accurate is a free email checker?
Some checks are right every time. Others depend on the remote mail server cooperating.
<1%
False positive rate
Sub-1s
Median response time
10/day
Free checks on this page
100/month
Free API validations with an account
Syntax, MX and disposable checks are deterministic: the same address always gets the same answer. SMTP and catch-all detection depend on the destination mail server, which is why some results come back risky or unknown rather than guessed.
When should you use the API instead of this page?
The API returns the same signals plus structured fields and 50,000 monthly validations on the paid plan. The free tier is 100 a month, no card.
One address, by hand
This page
A handful of leads from a CSV
This page, or the API with a 10-line scriptEvery signup, every form submit
Email validation API. Call it from your backend.Hundreds of thousands a month
Email validation API, Standard plancurl -X POST https://api.trueguard.io/v2/email/validation \
-H "X-API-KEY: $YOUR_KEY" \
-H "Content-Type: application/json" \
-d '{"email":"name@example.com"}'Why check email addresses at all?
One bad address costs more than you think. It bounces, it lands you on blocklists, it sneaks a fake account into your free tier, or it sits in your CRM as a dead lead. Verification is one call that pays back across every signup you accept and every email you send.
Stop fake signups at the form
Protect sender reputation
Clean an old list before you mail it
Qualify leads at capture
Questions about verifying email addresses.
Still stuck? Contact support or read the documentation.
Is this email verifier really free?
Yes. 10 verifications per day. No signup, no credit card, no email required. A free Trueguard account gets you 100 a month through the API. The paid plan is $49.99 a month for 50,000 validations.
Can you verify an email without sending an email to it?
Yes. That is exactly what this verifier does. It checks the address against the RFC syntax, looks up the MX records, and opens an SMTP handshake with the destination mail server without ever sending a message. The recipient sees nothing.
What does a "risky" result mean?
Risky means the address can receive mail but carries a warning sign: a disposable domain, a full mailbox, a high-risk domain ending, or a catch-all domain where the mailbox could not be confirmed. The result card names the specific reason so you can decide how to treat it.
Will the person I check be notified?
No. The SMTP check stops before any message is queued or delivered. Some mail servers log probe attempts in their own logs, but no end user sees anything.
Why does the verifier return unknown for some addresses?
Some mail servers block verification checks or do not answer clearly, so we return unknown rather than guess. Catch-all domains are a different case: they return risky, or safe or invalid when a second check resolves the mailbox.
Can I check Gmail, Outlook, and Yahoo addresses?
Yes. The verifier handles every provider: Gmail, Outlook, Yahoo, iCloud, Proton, Zoho, and any custom domain. Free-provider and role-based addresses are flagged in the result, but the flags do not change the verdict, so a working Gmail address still comes back safe.
How do I check more than 10 emails per day?
Sign up for a free Trueguard account. That lifts you to 100 verifications per month through the API. For higher volume, the $49.99 per month plan includes 50,000 validations and a REST endpoint you can call from your backend.
Is this the same product as Trueguard's fraud detection?
No. Email verification is a standalone product on the same account. You can use the free verifier or the API without touching Trueguard's fraud detection. They share an API key and a brand, not a billing meter.
Further reading
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