Free Email Verifier

Yes. You get 10 free email checks per day with no account, no credit card and no email capture form — the result appears right on the page. We built the tool for our own sales team and left it open because the best advert for a verified lead database is showing you what verification actually looks like. If you need more than 10 checks a day, a free LeadQuasar account gives you access to 9.6 million+ contacts whose emails are already verified.

Paste it into the verifier and you get the part that can be proven: whether the address is correctly formatted and whether its domain has a mail server (MX record). If the domain has no mail server, the address cannot exist as a working inbox and anything sent to it will bounce. What no free check can prove is that the individual mailbox exists — mail servers either refuse that question or, on catch-all domains, accept every address. A 'valid' result means the address passed every check that can be run without sending to it.

The verifier flags the three things that make an address a bad one to send to: a domain with no mail server (it will bounce), a disposable throwaway provider (nobody will read it), and a role inbox such as info@ or sales@ (it delivers, but to a shared queue). It also tells you whether the address is on a company domain or a free consumer provider like gmail.com. It does not scan messages you have received for phishing — if you are unsure whether an email in your inbox is genuine, do not click its links, and check the sender's domain against the organisation's real website.

Compare the part after the @ with the big consumer mail services. The verifier does this for you: it checks the domain against a list of free providers, including gmail.com, outlook.com, hotmail.com, yahoo.com, icloud.com and proton.me, and labels the address either a free consumer provider or a company domain. A domain that is not on that list is treated as a company or custom domain, so for an unfamiliar one, open the domain in a browser: a real business usually has its own website there.

Check that its domain still has a mail server, then look at when the record was last verified. If the verifier finds no MX record, the address is dead and anything sent to it will bounce. If the domain passes, no free check can prove the individual mailbox still exists, so a recent verification date and a clean bounce history are the best evidence you have. Remove addresses that bounce after your first send.

It depends on what is being claimed. We can establish with near-certainty whether an address is correctly formatted, whether its domain has a working mail server (an MX record — no MX means the address physically cannot receive email), whether the domain is a known disposable/throwaway provider, and whether the address is a role inbox like info@ or sales@. Those four checks catch the overwhelming majority of real-world bad addresses: typos, dead domains, burner signups and shared inboxes. What nobody can reliably promise is mailbox-level certainty — see the next question.

Honestly, no — and neither can anyone else, reliably. Proving that a specific mailbox exists requires an SMTP RCPT-TO handshake on port 25, which cloud hosts block by default and which most modern mail servers refuse, rate-limit or answer with a deliberate 'accept-all' lie to defeat exactly this kind of probing. Providers who advertise 99% mailbox accuracy are mostly inferring it from patterns and historical bounce data. We would rather show you the evidence we do have and let you make the call.

A disposable address comes from a throwaway provider like Mailinator or 10MinuteMail — it exists for a few minutes so someone can grab a download without giving you a real address. A role address (info@, sales@, support@, hello@) is a shared inbox rather than a person. Both hurt you: disposable addresses inflate your list with people who will never read anything, and role inboxes have poor reply rates and are treated as spam-prone signals by some filters. Removing both before you send protects your deliverability.

Mailbox providers watch your bounce rate. Above roughly 2% they begin throttling you, and above 5% they may start routing you to spam or blocking you outright — for every recipient, not just the bad ones. One dead domain in a list of a hundred can be enough to damage the sender reputation of the whole domain you send from. Verification is a few seconds of work that protects an asset that takes months to rebuild.

This free tool checks one address at a time, which is what most people need when they are sanity-checking a contact they just found. If you are working at list scale, the better fix is upstream: instead of buying a list and then cleaning it, start from contacts that are already verified. LeadQuasar holds 9.6 million+ B2B contacts across 170+ industries with verification status and a 0–100 quality score on every record, so you only unlock the ones worth sending to.