Free Email Verifier: Check If an Email Address Is Valid
To check if an email address is valid, run it through an email verifier. Paste the address below and Cleanlist validates the syntax against RFC 5322, looks up the domain's DNS and MX records to confirm a live mail server exists, and flags disposable mailboxes and role-based addresses like info@ or sales@. The verdict comes back in about two seconds. This email checker is free for 25 addresses a day, with no signup and no card.
Last updated August 2, 2026
What this free verifier covers
"Email verifier", "email checker" and "email validator" describe the same job, and this tool does it at the DNS layer: RFC 5322 syntax, a live MX record lookup against the domain's authoritative nameservers, role-based detection, and a disposable-provider filter. It stops short of the mailbox layer. Confirming that one specific mailbox exists requires an SMTP handshake, and separating real mailboxes from catch-all domains requires cross-checking more than one verification source. Cleanlist runs both on paid verification, 1 credit per email, and a free account includes 30 credits a month with no card.
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Who uses the free email checker?
Teams across go-to-market rely on clean, verified data. Here is where this tool fits.
Sales teams
Stop wasting reps' time on dead leads and bad data before outreach.
Marketers
Clean lists before a campaign to protect deliverability and spend.
Recruiters
Confirm candidate contact details are real before reaching out.
Founders
Validate key contacts before emailing partners, investors, or buyers.
RevOps
Keep the CRM accurate so routing, scoring, and reporting hold up.
Agencies
Double-check client data before it ever touches a live campaign.
How does Cleanlist verify an email address?
Cleanlist verifies an email address in five stages. The first four run free on this page. The fifth, the SMTP mailbox handshake and catch-all detection, runs on paid verification inside the platform, because it requires a connection to the receiving mail server and a second verification source to interpret the reply.
- 1
Syntax check (RFC 5322)
Cleanlist parses the local part, the @ sign, and a domain with at least one label and a real top-level domain. This catches typos and malformed pastes before any network call.
- 2
DNS and MX record lookup
Cleanlist queries the domain's authoritative nameservers for MX records and returns the count and the primary mail exchange. No MX record means the domain cannot receive mail at all.
- 3
Disposable provider filter
Cleanlist checks the domain against a maintained list of throwaway mailbox services such as Mailinator, Guerrilla Mail and YOPmail, which run real mail servers and therefore pass an MX check.
- 4
Role-based address detection
Local parts like info@, sales@, support@ and billing@ are flagged as shared function addresses rather than personal mailboxes, since they are filtered harder and complain at a higher rate.
- 5
SMTP handshake and catch-all detection (paid)
Cleanlist opens a connection to the MX host and issues EHLO, MAIL FROM and RCPT TO to read whether the server would accept mail for that exact mailbox, then cross-checks the result through the verification vendors ZeroBounce and Emailable to separate genuine acceptances from catch-all domains that accept everything.
Background reading: what email verification is, catch-all domains, and Cleanlist's verification engine.
How do I check if an email address is real?
To check if an email address is real, verify it in three layers: syntax, DNS, and mailbox. Cleanlist's free email verifier runs the first two on this page. Cleanlist parses the address against RFC 5322, queries the domain's authoritative nameservers for MX records to confirm a live mail server exists, then flags known disposable mailbox providers and role-based local parts like info@ or sales@. What a DNS-level check cannot do is prove that one specific mailbox exists on a live domain. That takes an SMTP handshake, where a verifier opens a connection to the mail server and asks whether it would accept mail for that exact address without ever sending one. Cleanlist runs the SMTP layer on paid verification, through the verification vendors ZeroBounce and Emailable.
What is an SMTP handshake?
An SMTP handshake is a test conversation with a mail server that checks whether an address would be accepted, without sending an email. The verifier connects to the domain's MX host, identifies itself with EHLO, declares a return path with MAIL FROM, names the target address with RCPT TO, and reads the reply code. A 250 means the server would accept mail for that mailbox. A 550 means the mailbox does not exist. Cleanlist runs this layer on paid verification. The free checker on this page deliberately skips it: SMTP probes are slow, several large mailbox providers rate-limit or block them outright, and running them at volume from a shared IP is a reliable way to get that IP blocklisted.
What is the difference between email verification and email validation?
Email validation checks the format of an address, and email verification checks whether that address can actually receive mail. Validation is a parsing step: does the string have a legal local part, an @ sign, and a domain with a real top-level domain, per RFC 5322? Verification adds network checks: does the domain resolve, does it publish MX records, and will the mail server accept a message addressed to that specific mailbox? Most vendors, Cleanlist included, sell both under a single name, and "email checker" is the everyday umbrella term for the pair. The distinction matters in one practical case: a perfectly well-formed address at a dead domain passes validation and fails verification, and only the second result tells you whether it is safe to send.
What is a catch-all domain and why does it matter?
A catch-all domain is a domain configured to accept mail addressed to any mailbox at that domain, including mailboxes that do not exist. That setting defeats SMTP verification, because the server answers "accepted" for every address, so no verifier can separate a real mailbox from a typo. Microsoft 365 tenants and small self-hosted mail servers are the common cases. The practical consequence is that an address on a catch-all domain can come back valid from any verifier and still bounce later, once the receiving server sorts the message internally and finds no recipient. Cleanlist reports catch-all as its own status rather than calling it valid, so you can decide per segment whether to send, hold, or go find a different contact at that company.
What is a disposable email address?
A disposable email address is a temporary mailbox from a throwaway provider such as Mailinator, Guerrilla Mail, YOPmail or Temp-Mail, created to receive one message and then abandoned. Disposable addresses pass syntax checks and pass MX checks, because the throwaway provider runs real mail servers, so the only thing that catches them is a maintained list of known disposable domains. Cleanlist's free email verifier checks every address against that list and marks a match as invalid. Disposable addresses matter in two places: on signup forms, where they let someone claim a free trial without a reachable identity, and inside purchased B2B lists, where their presence is a dependable signal the list was assembled from low-quality sources.
What is a spam trap?
A spam trap is an email address kept alive by a mailbox provider or blocklist operator purely to catch senders mailing addresses they never earned. There are two kinds. A pristine trap was never a real person's address and was published where only a scraper would find it, so any message sent to it proves the sender harvested addresses. A recycled trap is a real mailbox that was abandoned, left to hard-bounce for months, then reactivated as a trap. No verifier can identify a spam trap with certainty, because a trap answers an SMTP handshake exactly like a live mailbox. What verification does is remove the dead and never-valid addresses that correlate with trap hits, which is why re-verifying a list before every send matters more than verifying it once.
What is a role-based email address?
A role-based email address belongs to a function rather than a person: info@, sales@, support@, admin@, billing@, hello@. Cleanlist's free email verifier flags these separately because they behave differently from personal mailboxes. They are usually shared by several people or routed straight into a ticketing system, they are filtered more aggressively, and a spam complaint from one counts against your sending domain exactly like a personal complaint. A role address is not invalid, and for some motions, support-led sales or procurement outreach, it is the correct target. For cold outbound aimed at a named individual, a role address is usually a sign that the contact record is a fallback rather than a real match, and worth replacing before you send.
What is an MX record and why does an email verifier check it?
An MX record is a DNS entry naming the mail servers responsible for a domain, each with a priority number, and an email verifier checks it because a domain with no MX record cannot receive email at all. Cleanlist queries the domain's authoritative nameservers directly and returns the record count and the primary mail exchange. A missing MX record is the most decisive signal available at the free tier: it means the address is undeliverable no matter how well formed it looks. A present MX record proves the domain accepts mail, not that the individual mailbox exists. To inspect a domain's full DNS picture, including SPF and DMARC alongside MX, use Cleanlist's free domain validator.
How do I verify a whole list of emails?
To verify a whole list, upload it as a CSV to a bulk verifier instead of checking addresses one at a time. In Cleanlist you import the CSV, map the email column, and Cleanlist runs syntax, DNS and MX checks plus an SMTP mailbox handshake and catch-all detection on every row, then returns a status per address that you can export back to CSV. Verification costs 1 credit per email either way. CSV upload sits on the paid plans: Starter is $79 a month for 1,500 credits, Pro is $229 for 5,000 and Scale is $599 for 15,000, each 25% cheaper billed annually. A free Cleanlist account is 30 credits a month with no card, enough to verify 30 addresses added by hand before you pick a plan. Pushing the verified statuses straight into HubSpot, Salesforce or Outreach is a Pro-and-above feature.
Is bulk email verification free?
Bulk email verification is free in small volumes and paid at scale, at every vendor including Cleanlist. Cleanlist's free tier is 30 credits a month with no card, and one verified email costs one credit, so 30 addresses a month are free. Free tiers read from published pricing pages on August 2, 2026: Hunter gives 50 credits a month and charges half a credit per verification, ZeroBounce gives 100 validation credits that refill monthly, Bouncer gives 100 credits on signup, Verifalia gives 25 verifications a day that expire nightly, and Snov.io gives a 50-credit trial that renews every 30 days. No vendor verifies a 50,000-row list for free. The single-address checker on this page is free for 25 checks a day with no account at all.
What bounce rate is acceptable for cold email?
Keep hard bounces under 2%, and treat the thresholds the mailbox providers publish as the real limit. Google's sender guidelines require every sender to authenticate with SPF or DKIM and to keep the spam rate reported in Postmaster Tools below 0.3%, with a recommended target below 0.10%; senders of 5,000 or more messages a day to Gmail must additionally publish a DMARC policy and support one-click unsubscribe. Yahoo requires one-click unsubscribe under RFC 8058 and urges every sending domain to publish a DMARC policy, and states it will not specify a volume threshold for what counts as a bulk sender. Bounce rate and spam rate are different metrics, but they move together, and a high bounce rate is the fastest route to having a sending domain throttled.
Why did my email bounce after verification?
An email can bounce after passing verification for four reasons. First, the mailbox was deactivated between the verification date and the send: Cognism reports that 22.5% of B2B data goes bad each year, so a list verified months ago has already drifted. Second, the address sits on a catch-all domain, so the mail server accepted it during the SMTP handshake and rejected it internally afterwards. Third, it was a soft bounce (full mailbox, greylisting, a temporary outage) rather than a hard bounce, and it will clear on retry. Fourth, the rejection was about you rather than the address: a broken SPF, DKIM or DMARC setup on your sending domain, or a damaged domain reputation, produces rejections that look like bounces but would happen to every recipient.
Does email verification mean my email will reach the inbox?
No. Email verification tells you an address exists and can receive mail, and says nothing about whether your message will be accepted. Delivery is decided on the sender side: your domain's SPF, DKIM and DMARC records, your sending IP and domain reputation, your complaint rate, how fast you ramped volume, and content filtering. Google's sender guidelines make this explicit, requiring authentication and a Postmaster Tools spam rate below 0.3% regardless of whether the recipient address is valid. Verification removes exactly one failure mode, the invalid recipient, and it happens to be the failure mode that damages sender reputation fastest. Verification cannot compensate for an unauthenticated sending domain, a cold IP pushing 10,000 messages on day one, or copy that trips content filters.
How accurate is email verification?
Accuracy depends on how deep the checks go, and no verifier is 100% accurate. A DNS-level check, which is what this free tool runs, catches every malformed address, every dead or misspelled domain and every known disposable provider, and cannot rule on whether one specific mailbox exists on a live domain. An SMTP-level check adds the mailbox verdict and is conclusive except on catch-all domains, where the server accepts everything by design. Cleanlist's product spec for emails returned from enrichment is 98% verified, cross-checked across a waterfall of 15+ providers plus the verification vendors ZeroBounce and Emailable. Treat any advertised near-perfect deliverability rate as a marketing number, because SMTP gives no verifier a way to prove it.
How often should I verify my email list?
Verify a cold list immediately before every send, and re-verify your CRM at least quarterly. The reason is decay rather than error: people change jobs, companies get acquired, domains lapse, and Cognism reports that 22.5% of B2B data goes bad each year, close to 2% a month. A list verified in January and sent in June has drifted by about a tenth. The rule Cleanlist recommends is to re-verify any segment not mailed in 60 days, verify every imported list before its first touch, and run a full CRM pass each quarter. Verification costs 1 credit per address in Cleanlist, so a quarterly pass over 5,000 records costs 5,000 credits, which is exactly one month of the $229 Pro plan's allowance.
Which email verification tools have a free tier?
Six email verification tools publish a free tier, and the sizes differ by more than an order of magnitude. Every figure below was read from the vendor's own published pricing page on August 2, 2026, with the source linked in each row.
| Tool | Free tier | Refresh | Entry paid price | Source |
|---|---|---|---|---|
| Cleanlist (this page) | 25 checks, no account | Daily | Free, DNS layer only | This page |
| Cleanlist account | 30 credits, no card | Monthly | $79/mo Starter, 1,500 credits | cleanlist.ai/pricing |
| Hunter | 50 credits (0.5 per verification) | Monthly | $49/mo Starter, $34/mo annual | hunter.io/pricing |
| ZeroBounce | 100 validation credits | Monthly | $99/mo, 10,000 credits minimum | zerobounce.net/pricing |
| Bouncer | 100 credits on signup | Not stated | $8 per 1,000 ($0.008 each) | usebouncer.com/pricing |
| Verifalia | 25 verifications | Daily, expire nightly | Shown after currency selection | verifalia.com/pricing |
| Snov.io | 50-credit trial | Every 30 days | $39/mo Starter, 1,000 credits | snov.io/pricing |
Read from each vendor's published pricing page on August 2, 2026. Credit units are not comparable across vendors: one Cleanlist credit verifies one email, while Hunter charges half a credit per verification. Bouncer publishes 100 signup credits without stating whether they recur, so the refresh column reads "not stated". NeverBounce is omitted because its pricing page did not serve a public response on that date. Prices change; check the linked source before budgeting.
“Email verification is the cheapest insurance policy in B2B outbound. A 30-second MX check before a campaign protects the one asset you cannot buy back quickly, which is your sending domain's reputation. We built this free tool because every team should run it, even the ones that never become Cleanlist customers.”
You checked one. Do the other 4,999.
This page verifies a single address at the DNS layer. Inside Cleanlist every address also gets the SMTP mailbox handshake and catch-all detection, cross-checked through the verification vendors ZeroBounce and Emailable, at 1 credit per verified email. Start with 30 credits a month free, no card. CSV upload for whole lists starts on Starter at $79 a month for 1,500 credits.
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Frequently Asked Questions
Is there a usage limit on this free email verifier?
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Yes. Cleanlist allows 25 free checks per IP per day on this page, with no account and no card. Past that, a free Cleanlist account adds 30 credits a month, and one credit verifies one email with the SMTP and catch-all layer included. Bulk CSV upload starts on the Starter plan at $79 a month for 1,500 credits.
Is email verification legal?
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Yes. Verification reads public DNS records (MX, A, TXT) to confirm a mail server exists, and an SMTP handshake ends the connection before any message is sent. It never delivers an email and never accesses a mailbox. The mail you send after verification still has to comply with CAN-SPAM, GDPR and CASL.
Does Cleanlist store the addresses I check here?
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No. Addresses submitted to this free tool are processed in memory to run the DNS lookups and discarded once the response is returned. No address is written to a list, stored in a database, or shared. The only thing Cleanlist stores is a per-IP counter that enforces the 25-a-day limit, and it holds a count and a date, not the addresses you checked.
Does this work for Gmail, Outlook and Microsoft 365 addresses?
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Yes for the DNS layer, with one caveat at the mailbox layer. Syntax, MX and disposable checks work identically for every provider. Microsoft 365 tenants are frequently configured as catch-all, which means mailbox-level SMTP verification cannot return a definitive verdict for them at any vendor, so Cleanlist reports catch-all as its own status instead of guessing.
Can I use this on a competitor's contact list?
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Yes. The tool reads public DNS records only. It sends no mail, touches no inbox, and keeps nothing you submit. Whether you may email the people on that list is a separate question governed by CAN-SPAM, GDPR and CASL, not by this tool.
References & further reading
The checks this tool performs are governed by IETF standards and industry deliverability research. The primary sources we follow:
- 1.RFC 5321: Simple Mail Transfer Protocol. Defines the SMTP handshake we reference for full mailbox-level verification.
- 2.RFC 5322: Internet Message Format. The syntax specification this tool validates against in step 1.
- 3.RFC 6376: DomainKeys Identified Mail (DKIM). Authentication signal used by Gmail/Microsoft to assess sender reputation after the verification step.
- 4.RFC 7489: DMARC. Policy framework that determines what receivers do with mail that fails authentication checks downstream of verification.
- 5.Google: Email sender guidelines. Source for the requirements quoted on this page: SPF or DKIM for every sender, a Postmaster Tools spam rate below 0.3% (recommended below 0.10%), and for senders of 5,000 or more messages a day to Gmail, a published DMARC policy plus one-click unsubscribe.
- 6.Yahoo: Sender Hub FAQs. Source for Yahoo's one-click unsubscribe requirement under RFC 8058, its recommendation that every sending domain publish a DMARC policy, and its statement that it will not specify a volume threshold for bulk senders.
- 7.Cognism: Data Decay & Degradation. Source for the roughly 22.5% annual B2B data decay rate cited on this page, which is the reason a list verified once is not verified forever.