Email Validator

Run email validator on one address or a csv list: an email verification tool for syntax, typos, mx records, smtp and dead domains.

🛡️ Email validator that says what it sends and what it never does Checking an address means asking somebody else's mail server about it. This email validator is explicit about which addresses leave your browser, which ones never do, and what becomes of the ones that go. 🔐 Nothing goes out until you press check The email validator extension sends nothing while it sits open — not one request, not one address. Press check, or start a file, and only the rows this browser cannot settle leave the tab. There is no account to make: an anonymous install id is the whole of it. Remove the extension and that id, with every stored result, leaves the machine with it. There is no telemetry and no analytics, and a stored record is erased whenever you ask. 🧠 What the email validator tool keeps on your machine ➤ syntax, against a practical subset of rfc 5322 ➤ disposable domains, and role addresses such as info@ or support@ ➤ gmail dots, +tags and yandex aliases, folded into one normalised form ➤ typo hints you accept in one click — did you mean user@gmail.com? ➤ mx and a records, resolved publicly with a fallback resolver behind them 📮 What actually reaches our server Only the rows this email validator cannot settle alone, one line each, with no file, no file name and no neighbouring columns. Addresses are checked in your browser first; only those needing a mailbox check are sent to our server, and they are deleted right after. We cache results as irreversible keyed hashes, never as addresses. 🧩 Five answers, not two ▸ valid — the mail server accepted this mailbox ▸ risky — a role address, a suspected typo, or a mailbox that is full ▸ catch-all — the domain takes everything, so no single mailbox can be proven ▸ unknown — dns or the mail server stayed quiet, and a retry is worth it ▸ invalid — broken syntax, a dead domain or a disposable mailbox 🚀 Three minutes from install to answers 1. add the extension from the Chrome Web Store and pin it 2. paste one address, or drop a .csv, .xlsx or .txt file of up to 50 000 rows 3. read the verdict together with the signal that produced it 4. start a bulk email validator run and leave it alone 5. export the result as csv in utf-8 with a bom 📋 What a list run looks like 1️⃣ the right column is detected for you, or you choose it yourself 2️⃣ duplicates disappear before a single row is sent anywhere 3️⃣ the whole file is on screen from the first second, pending rows marked 4️⃣ pause, resume from the same row, or stop and keep what you have 5️⃣ close the tab or restart chrome — an email validator run outlives both 📊 What comes back The checked list arrives as a new csv: address, verdict, reason, suggestion and normalised form, in utf-8 with a bom so excel opens it correctly. Filter by verdict, search by row or by suggestion, and run the file again once the allowance is back: 2 000 rows a day for every install, and whatever the browser settled costs none of it. A badge on the icon keeps the percentage in sight, and the window follows your system theme down to a 320 px width. 🧾 More than an email checker that says yes or no This email validator points at the signal instead: no mx record, a full mailbox, a role account, a domain that answers for everyone. It turns down a disposable mailbox on purpose — those live for hours and are useless to write to. 🌍 Who wants an email validator tool like this ▸ teams cleaning a list before the first message goes out ▸ people needing a yahoo mail checker today and a corporate domain tomorrow ▸ anyone who would rather read a reason code than a score out of ten ▸ a one-off clean-up, not a contract and not a subscription ▸ developers after an email verifier in the browser they already keep open 🤖 Questions people ask ❓ how to verify email address without writing to it? ▸ The mail server is asked whether the mailbox exists, and no message is delivered. ❓ how to check mail id valid or not? ▸ Paste one, or load a list, and the reason arrives beside the verdict. ❓ is this a mail tester? ▸ No. Mail-tester scores a message you wrote; this one weighs the recipient. ❓ can i run the same file again tomorrow? ▸ Yes, and the answer comes back fresh; rows the browser settled cost you nothing. 🎯 Know what leaves your browser before it leaves. Add the email validator for chrome, and leave a mail tester to worry about messages.