Free Email Verifier
Check if an email address is valid in seconds. No signup required. Syntax, MX, disposable detection and more.
10 free verifications per day · No signup required
How email verification works
Verifying an email address involves several independent checks, each catching a different category of bad or risky addresses.
Syntax check
The first check confirms the email matches the RFC 5322 format: a local part, an @ symbol, and a valid domain. Catches typos like missing @ or invalid characters instantly.
MX record lookup
A DNS query checks whether the domain has mail exchange (MX) records. Without MX records, the domain cannot receive email — no matter how correctly spelled the address is.
SMTP verification
We simulate a connection to the mail server and check whether the specific mailbox accepts email. This is the most accurate check — but not every server allows it.
Disposable detection
We check the domain against a continuously updated database of 50,000+ temporary email services. Disposable addresses are used to bypass signup walls and trials.
Role & catch-all checks
Role-based addresses (info@, support@) belong to departments and have lower engagement. Catch-all servers accept everything, making individual mailbox checks unreliable.
Score & decision
Each check contributes to a 0-100 deliverability score. Based on this, the result is classified as Deliverable, Risky, Undeliverable, or Unknown.
What each result means
Use this guide to decide what to do with each type of verification result.
| Check | What it means |
|---|---|
| Syntax | The email address is correctly formatted with a valid local part, @, and domain. |
| MX Record | The domain has valid mail server records and can receive email. |
| SMTP | The mail server was contacted and the specific mailbox appears to exist. |
| Not Disposable | The domain is not a known temporary/throwaway email service. |
| Not Role-based | The local part is not a department inbox like info@, admin@, or support@. |
| Not Free Provider | The domain is not a consumer email service like Gmail or Yahoo. |
| Not Catch-all | The server does not accept all emails to the domain regardless of mailbox existence. |
Why developers choose Mailbeam over free tools
Tools like MX Toolbox, Hunter, and other free checkers are useful for one-off lookups. When you need to verify emails at scale — or integrate verification into your product — you need an API.
- Sub-100ms real-time verification for signup forms
- Batch endpoint for cleaning entire contact lists
- Live SMTP handshakes, not just DNS checks
- Continuously updated disposable domain database
- SDKs for Node.js, Python, PHP, Ruby, and Go
- EU-hosted, GDPR-compliant, no data retention
// Verify at signup — Node.js
const mb = require("@mailbeam/node");
const client = new mb.Client({
apiKey: process.env.MAILBEAM_KEY
});
app.post("/signup", async (req, res) => {
const { email } = req.body;
const result = await client.verify(email);
if (!result.valid || result.disposable) {
return res.status(400).json({
error: "Please use a valid email address."
});
}
// proceed with signup...
});When to verify email addresses
Email verification isn't just for bulk list cleaning. Here are the most common scenarios where it directly impacts your business.
Signup forms
Catch fake, mistyped, and disposable emails at the point of registration. Improve deliverability and reduce fraud from day one.
Email list hygiene
Before sending a campaign, verify your list to reduce bounce rates. A bounce rate above 2% can get your domain blacklisted.
CRM data quality
Imported contacts from trade shows, webinars, or sales reps often contain errors. Verify before importing to keep your CRM clean.
Lead generation
Verify leads from forms, landing pages, or lead gen platforms before they enter your funnel — or billing you for junk data.
Free trial abuse prevention
Disposable emails are the first tool of serial trial abusers. Block them at signup to protect your free tier.
Transactional email reliability
Password resets, order confirmations, and invoices must reach the inbox. Verify addresses before sending critical messages.
Frequently asked questions
Need to verify thousands?
Sign up for a free Mailbeam account and get 1,000 verifications per month — plus full API access, SDKs, and batch verification. No credit card required.
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