Free tools / No signup
Check whether an email will land, before you send.
Paste up to 10 addresses and get a verdict on each: deliverable, risky, undeliverable or unknown. The check goes to the mailbox, not to a pattern, so a well-formed address at a dead domain fails the way it should.
Nothing you paste is stored. Thirty addresses a day per visitor. This checks whether a mailbox accepts mail; it does not check whether the person still holds the role or fits your profile.
What the verdicts mean
Deliverable means the mailbox accepted the check. Risky means the domain accepts anything (a catch-all), the address is a role like info@ or sales@, or it belongs to a disposable service; sends may land now and bounce later. Undeliverable means the domain or the mailbox rejected the address; remove it before sending. Unknown means the server did not answer conclusively, which some providers do on purpose; re-check later or let the bulk verifier retry with a second source.
Why bounces matter more than they look
Mailbox providers score the sending domain, not the campaign. A list with a five percent bounce rate can push a domain into filtering for weeks, and every later campaign pays for it. Verifying before the first send is the cheapest deliverability work there is; our guide to email verification and deliverability for outbound covers the rest of the protocol.
Questions, answered
What does the verifier actually check?
Four things, in order: that the address is well-formed, that the domain exists and accepts mail, that the mailbox itself accepts the address when the server allows that check, and whether the domain is a catch-all that accepts anything. The verdict per address is deliverable, risky, undeliverable or unknown.
Is a deliverable verdict a guarantee?
No. It means the mailbox accepted the check at that moment. It does not prove the person still holds the role, that you have permission to write to them, or that the message will avoid a spam folder. Treat it as one gate among several before a send.
Why is the free version limited to ten addresses per check?
Each check costs us a live lookup, and an open endpoint with no limit becomes a target for scripts within hours. Ten per check and thirty per day is enough to test a tool or clean a short list; whole lists run in a workspace, where verification is part of every delivery.
Do you keep the addresses I paste?
No. The addresses are sent to the verification source, the verdicts come back to your browser, and nothing is stored on our side except a daily count against a salted hash of your connection, which is discarded after two weeks.
Can I verify a whole list?
Yes, in a workspace. Import a CSV or point an agent at a CRM segment and the verification agent checks every address, removes duplicates and suppressed contacts, and records the verdict on each row before anything is delivered to a sequencer.
Beyond the free version
Bulk verification on whole lists, dedupe and suppression, and delivery into your CRM or sequencer.
Every workspace ships every agent and the full data catalog, with a source on every field, verification before any send, and an approval on every write. The trial is three days with 200 credits.
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