Free Email Verifier — Check if an Email Is Valid in 2 Seconds
Live MX record lookup, role-based detection, and disposable domain filtering — no signup required for the first 25 checks per day.
TL;DR
Paste any email address below. We check the syntax against RFC 5322, run a live MX record lookup against the domain's nameservers, detect role-based addresses (info@, sales@), and flag disposable mailbox providers. Results in under 2 seconds. The free tier gives you 25 verifications per day with no signup. For SMTP mailbox checks and bulk verification, sign up for Cleanlist's 30 free credits.
25 of 25 free checks remaining today
What email verification actually checks
Email verification confirms that an address is properly formatted, uses a real domain, and points at a live mail server. It is the first line of defense against bounce-driven sender reputation damage. Industry benchmarks put a healthy bounce rate below 2% — sending to unverified lists routinely produces bounce rates above 10%, which Gmail and Microsoft penalize within days.
This free tool uses a four-stage pipeline: RFC 5322 syntax validation, live MX record lookup via Node DNS, role-based local part detection, and disposable domain filtering against a curated list of throwaway providers. It does not perform SMTP handshakes — those are slow, frequently blocked, and risk damaging your IP reputation. For full SMTP-level verification, see our email verification glossary entry or Cleanlist's verification engine, which cross-references multiple providers for 98% accuracy.
How it works
- 1
Syntax check
We validate against RFC 5322 — local part, @, and domain with at least one dot and a valid TLD.
- 2
Live MX lookup
We query the domain's authoritative nameservers via Node DNS and return the count and primary mail exchange.
- 3
Role detection
Local parts like info@, sales@, support@ are flagged — they often have lower deliverability and engagement.
- 4
Disposable filter
We check a curated list of throwaway mailbox providers like Mailinator, Guerrilla Mail, and Yopmail.
Free email verifiers compared
| Tool | Free quota | MX check | SMTP check | Bulk |
|---|---|---|---|---|
| Cleanlist (this tool) | 25/day free | Yes | Paid only | Paid only |
| Hunter | 25/month | Yes | Yes | Paid only |
| ZeroBounce | 100 once | Yes | Yes | Yes (paid) |
| NeverBounce | No free tier | Yes | Yes | Yes (paid) |
Free quotas reflect each provider's public pricing as of April 2026.
“Email verification is the cheapest insurance policy in B2B outbound. A 30-second MX check before a campaign saves your sender reputation, which takes 30 to 60 days to recover once it's damaged. We built this free tool because every team should run it — even if they never become a Cleanlist customer.”
Frequently Asked Questions
How does this free email verifier work?
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It runs four checks in real time: (1) RFC 5322 syntax validation, (2) live MX record lookup against the domain's nameservers, (3) detection of role-based addresses like info@ or sales@, and (4) a curated list of disposable / throwaway email providers. Results return in under two seconds with no signup required.
Do you actually connect to the mail server (SMTP)?
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No. We deliberately do not perform SMTP handshakes from this free tool — they're slow, frequently blocked by major mailbox providers, and can damage your sender reputation if abused. For full SMTP-level verification (including catch-all detection and mailbox existence) use Cleanlist's verification engine, which cross-references multiple verification providers for 98% accuracy.
How accurate is a free MX-based email check?
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MX-based verification catches roughly 70-80% of bad addresses: every typo'd domain, expired domain, and disposable mailbox. It cannot detect specific mailboxes that don't exist on a valid domain — for that you need full SMTP verification. We're upfront about this limitation so you can decide when free is enough.
Is there a usage limit?
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Yes — 25 free verifications per IP per day. After that the tool prompts you to sign up for a Cleanlist account, which includes 30 free credits and access to bulk verification, SMTP checks, and the API.
Is email verification legal?
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Yes. Verification reads public DNS records (MX, A, TXT) to confirm a mail server exists. It never sends an actual email, never accesses inboxes, and never stores the addresses you check. The emails you send after verification must still comply with CAN-SPAM, GDPR, and CASL.
What's the difference between email validation and email verification?
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Email validation checks format only — does the address have a valid local part, an @ sign, and a domain with a TLD? Email verification adds a DNS check to confirm the domain has live mail servers, plus deeper signals like role-based and disposable detection. This tool does both.
How does this compare to Hunter, ZeroBounce, and NeverBounce?
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Hunter offers 25 free verifications/month with paid SMTP checks, ZeroBounce offers 100 free once with paid features, NeverBounce has no free tier at all. Our free tool offers 25/day (so ~750/month) with MX, role, and disposable detection — but no SMTP. For full SMTP catch-all detection and 98% accuracy waterfall verification across 15+ providers, sign up for Cleanlist (30 free credits, no card).
What is a catch-all domain and why does it matter?
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A catch-all domain accepts every email address sent to it at the SMTP level — even if the specific mailbox doesn't exist. About 12-18% of B2B domains are catch-all (especially Microsoft 365 tenants and small business mail servers). Free tools mark these as 'valid' but the addresses may still bounce when you send. Cleanlist's full verifier cross-references multiple providers to detect catch-all domains and predict actual deliverability — single-source tools cannot.
Can I bulk-verify a list of emails?
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This free tool verifies one email at a time. For bulk verification (100 to 1,000,000+ emails), upload a CSV to your free Cleanlist account — 30 credits free, then $0.005/email at scale. Bulk verification runs the same MX/role/disposable checks plus full SMTP handshake, catch-all detection, and confidence scoring on every record.
How often should I verify my email lists?
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B2B email data decays at 22.5% per year — roughly 2.1% per month. Re-verify cold lists before every send, and run quarterly verification on your active CRM contacts. Teams that verify monthly see bounce rates drop from 8-12% to under 2%, protecting sender reputation and inbox placement.
Why are my verified emails still bouncing?
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Three common reasons: (1) the email passed MX checks but the specific mailbox was deactivated after our last verification (set up monthly re-verification to catch this), (2) the domain is a catch-all that accepted then silently dropped — which only SMTP-level verification catches, and (3) sender reputation issues unrelated to address validity. For SMTP + catch-all detection, upgrade to Cleanlist's full verifier.
Does this tool work for verifying email addresses in bulk on a CSV?
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This free single-address tool doesn't process CSV uploads. For CSV verification, sign up at cleanlist.ai — 30 free credits gets you started, and the bulk verifier runs MX + SMTP + catch-all detection + role detection on each row, returning a confidence score per email. Most teams process their first 5K-50K list in under 5 minutes.
Is this email verifier safe to use on competitor data?
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Yes. Verification only reads public DNS records — never sends mail, never accesses any mailbox, never stores or shares the addresses you submit. Submissions are processed in-memory and discarded after the response. Use it on prospect lists, competitor employee lists, conference attendees, or any contact data you've legitimately obtained.