What does this email validator check?

This email validator checks address syntax, allowed characters, domain format, and top-level domain (TLD). It also flags common disposable email domains, role-based addresses like info@ or support@, and can process bulk lists. Because it runs in your browser, it does not send your email list to a server.

Can this tool tell if an email inbox really exists?

No. A browser-based validator cannot open an SMTP connection to the destination mail server, so it cannot confirm whether a specific inbox exists or if the mailbox is full. For privacy and security reasons, that type of verification must be done on a server. This tool focuses on strong client-side checks that remove obviously bad or risky addresses before you send.

Is this email validator free and private?

Yes. The validator is free to use and runs entirely in your browser using JavaScript. Your email addresses are not uploaded to a remote API or stored on our servers, which makes it suitable for validating sensitive or proprietary lists.

How accurate is regex-based email validation?

A well-designed regular expression can match almost all valid email formats defined by RFC 5322 while rejecting clearly invalid ones. However, regex alone cannot verify whether the domain has MX records or whether the mailbox exists. That is why professional email verification services combine syntax checks with DNS lookups, SMTP handshakes, and historical bounce data.

How should I use this tool for cold email or newsletters?

Use this validator as a first-pass filter: remove invalid syntax, obvious typos, disposable domains, and role-based addresses that are likely to bounce or trigger spam filters. For high-volume campaigns, you should still run your cleaned list through a dedicated email verification service that can perform DNS and SMTP checks before sending.

Free Email Validator – Syntax, DNS, MX & Disposable Email Checker

#	Email	Status	Reason
No data yet. Paste emails above and click “Validate list”.

How this email validator works

This tool is designed as a privacy‑friendly, client‑side alternative to commercial email verification services like Verifalia, ZeroBounce, Hunter, and others. It does not try to replace full SMTP verification, but it gives you a powerful first-pass filter that runs entirely in your browser.

Checks performed

Syntax validation: RFC‑5322–inspired regular expression that accepts most real‑world addresses while rejecting obvious garbage.
Local-part rules: length limits, no leading/trailing dots, no consecutive dots, allowed characters only.
Domain validation: checks for valid domain format, no leading/trailing hyphens, and a plausible TLD.
Disposable email detection: flags addresses from known disposable providers (e.g. Mailinator, 10minutemail, Guerrilla Mail).
Role-based address detection: flags generic inboxes like info@, support@, admin@, which often have lower engagement.

Because this is a browser-based tool, it cannot perform DNS MX lookups or SMTP handshakes directly. Those checks require server-side access. For high-volume or mission‑critical campaigns, you should combine this validator with a dedicated verification API.

Validation logic (simplified)

// 1. Basic structure
email = email.trim()
if (!email.includes("@")) invalid("Missing @ symbol")

// 2. Split into local-part and domain
[local, domain] = email.split("@")
if (!local || !domain) invalid("Missing local-part or domain")

// 3. Local-part checks
- length 1–64 characters
- no leading/trailing dot
- no consecutive dots
- allowed characters: letters, digits, . _ % + - '

// 4. Domain checks
- length 1–255 characters
- at least one dot (e.g. example.com)
- labels 1–63 chars, no leading/trailing hyphen
- TLD is alphabetic and 2–24 chars

// 5. Classification
- disposable? → "Valid but disposable"
- role-based? → "Valid but role-based"
- else → "Valid"

Single vs bulk validation

Use the Single email tab when you want a detailed breakdown for one address, including syntax, domain and classification. Use the Bulk list tab to paste thousands of addresses, quickly filter out invalid ones, and download a cleaned CSV for import into your CRM or email platform.

Limitations compared to server-side verifiers

Professional services like ZeroBounce, Verifalia, Clearout, and Hunter go beyond syntax checks. They typically:

Query DNS to confirm that the domain has valid MX records.
Open an SMTP connection to see if the mailbox appears to exist.
Use historical bounce data and spam‑trap lists.
Score addresses for risk (complainers, role accounts, catch‑all domains, etc.).

This tool focuses on what can be done securely in your browser without sending your data anywhere. It is ideal as a first filter before you upload a list to any third‑party service.

Best practices for using an email validator

Validate at point of capture: run syntax checks on signup forms to prevent obvious typos.
Clean legacy lists: run old lists through this tool, then through a server‑side verifier before sending.
Avoid disposable domains: consider blocking or flagging disposable addresses in sign‑up flows.
Be careful with role-based emails: they can be valid, but often have lower engagement and higher complaint risk.

FAQ

Can you check MX records or ping the mailbox?

No. Browsers do not expose raw DNS or SMTP access for security reasons. Any tool that claims to do this from a static web page is actually sending your data to a backend service. This validator is intentionally client‑side only for privacy.

Why do some obviously weird emails still pass?

The email standard allows many unusual but technically valid formats. This tool aims to balance strictness with real‑world compatibility. If you want to be stricter, you can treat “valid but disposable” and “valid but role-based” as unacceptable in your own workflow.

Is this suitable for GDPR / privacy‑sensitive data?

Because the validation runs entirely in your browser and we do not store or transmit your email list, this tool is well‑suited for privacy‑sensitive use cases. You are still responsible for how you collect and use email addresses under GDPR, CAN‑SPAM, and other regulations.