Free Tool
Free Email Verifier Tool
Trueguard's free email verifier, also called an email validation tool or email checker, checks any email address for syntax, MX records, SMTP deliverability, disposable domains, and catch-all behavior. You get 10 verifications per day with no signup, no credit card, and no email gate. The same checks run through our paid API.
Need to verify in bulk or from your backend? Use the API
Paste an address above. Or try one of the examples below.
How do I verify an email address without sending an email?
Three steps. Under five seconds. No message ever reaches the inbox.
Paste an email address
Drop the address into the box above.
Click Verify email
We do the rest. Syntax, MX, SMTP, disposable, catch-all. One call.
Read the result
Seven signals in one. No account, no card, the recipient sees nothing.
What does this email verifier check?
Seven layers in one card. Each has a dedicated tool if you want to dig in.
Syntax
Does the address match RFC 5322 grammar?
MX records
Does the domain publish mail servers?
SMTP deliverability
Does the destination server accept this mailbox? We stop before any message is sent.
Disposable
Is the address on a throwaway domain like Mailinator, Guerrilla Mail, Temp-Mail, or 10MinuteMail?
Catch-all
Is the domain set to accept mail for every address?
Role-based
Is this a generic shared mailbox rather than a person?
Free-mail provider
Gmail, Outlook, Yahoo, iCloud, Proton, Zoho. Flagged so you can treat personal addresses differently.
What does each result mean?
Four verdicts in plain English.
The address is real and the mail server confirmed it. Syntax passes, MX resolves, SMTP returned a clean acceptance. Mail you send should land.
The address cannot receive mail. Syntax is broken, the domain has no MX records, or the server rejected the mailbox. Sending will bounce.
The address is technically deliverable but carries a quality flag. Typically a disposable domain, a role-based mailbox, or a catch-all.
The destination server did not give a clear answer. SMTP servers that block verification probes land here.
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. Trueguard's disposable email database covers thousands of providers.
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. The verifier returns unknown rather than valid.
How accurate is a free email verifier?
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
100/month
Free API validations per month
Syntax, MX, and disposable checks are deterministic. SMTP and catch-all detection depend on the destination mail server. If you need this at scale, the email verification API returns the same answer with 50,000 monthly validations on the paid plan.
When should you use an API instead of this tool?
The API returns the same signals plus structured fields, webhooks, and 50,000 monthly validations on the paid plan. Free tier is 100 a month, no card.
One email, 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 verification API. Call from your backend.Hundreds of thousands a month
Email verification 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 verify email addresses?
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 API call that pays back across every signup you accept and every email you send.
Stop fake signups at the form
Disposable and invalid addresses shouldn't enter your database. Verify on the signup form and bounce the junk before it creates an account, eats a free-tier seat, or pollutes your conversion analytics.
Protect sender reputation
Mailbox providers penalize senders who hit dead addresses. A bounce rate above 2% gets you throttled. Above 5% you start landing in spam. Validate before the send and your deliverability stays clean.
Clean an old list before you mail it
Lists rot. People change jobs, abandon inboxes, get suspended. Run a list through verification before the next campaign and drop the dead addresses. Cheaper than the deliverability damage from sending anyway.
Qualify leads at capture
Form fills with info@, support@, or a temp-mail domain aren't real leads. Verification flags role accounts and disposables so sales spends time on contacts that can actually buy.
Frequently asked questions
Is this email verifier really free?
Yes. 10 verifications per day. No signup, no credit card, no email required. If you need more, 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's 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 is technically deliverable but carries a quality flag. Typically a disposable domain, a role-based mailbox, or a catch-all where deliverability cannot be proven. The result card surfaces 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 emails?
Catch-all domains accept any address at the mailbox layer, so SMTP cannot tell you whether the specific address actually exists. Some mail servers also block verification probes outright. In both cases we return unknown rather than guess.
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 addresses are flagged in the result so you can decide how to treat them.
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 or pipeline use, 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 or main verification flow. They share an API key and a brand, not a billing meter.
