The Free Email Validator That Catches Bad Addresses.

The validator opens a live SMTP conversation with the domain's mail server, asks whether that exact mailbox exists, and hangs up before any message is composed. The server's response code is the answer. The owner of the address never sees a thing: no email, no notification, nothing in their inbox.

That handshake is one of nine checks. The full pipeline, from RFC syntax through SPF/DKIM/DMARC authentication, is documented on the email verification service page if you want the per-check detail.

The catch is volume, never depth. You get 4 validations a day on this page with no account, then 1,000 free credits the moment you sign up (2,500 with a work address). No card at any point.

Every check the paid engine runs, the free tier runs too. If you later buy a credit pack, credits never expire, and an unused pack is refundable within 7 days under the refund policy, with volume discounts on larger packs.

A risk verdict with an AI-confidence score, not a shrug. Catch-all servers accept every address during the SMTP handshake, real or fake, which is why 20 to 40% of B2B email lists fail exactly there. Most free tools mark those addresses valid and let you eat the bounce.

Verifox layers an AI-confidence pass on top of catch-all detection, scoring domain age, authentication records, and mailbox signals to tell deliverable from dangerous. There's a dedicated catch-all email checker if that's your whole problem.

Yes. Export the sheet to CSV, upload it, and the engine runs all nine checks on every row. You get the file back annotated with a verdict and confidence score per address.

For a handful of addresses, pasting them into the multiple email checker is faster than exporting anything. Your 1,000 free signup credits cover most small lists outright; bigger jobs run on pay-as-you-go credits that never expire.

Directly, yes. Hard bounces come from addresses that fail the exact checks a validator runs: dead mailboxes, typo'd domains, disposable addresses that expired a week after capture. Strip those before the send and the bounces never happen.

That matters because inbox providers throttle senders whose bounce rate creeps past roughly 2%. If your list has already been burned, run it through the email bounce checker to triage, then keep the domain clean with the email health checker.

In practice, nothing. People say “validate email address” and “verify email address” to mean the same job: confirm an address is real, reachable, and safe to send to. Verifox runs the identical nine-check engine either way.

If you prefer the verification phrasing, the email verifier and the single-address free email checker are the same tool under different names. Same accuracy, same verification engine, same free tier.

This one is the paid tool, volume-capped. The same nine checksrun here, catch-all domains included, which get a 0-100 confidence score. There is no lighter “free pipeline” running behind this page.

Where free tools genuinely differ is which checks they bother with. Many stop at syntax and MX. The full nine-check stack, including the SMTP handshake and AI-scored catch-alls, is what the email verification tool and the paid API both run, and what this page runs too.

We never sell them. Addresses you validate are used only to run the verification and show you the result.

Our security overview covers the controls, and the privacy policy spells out exactly what we touch and for how long.

Yes. The REST API reference documents the inbound and outbound shapes for every endpoint, so you can drop real-time email validation into signup forms, CRMs, or any tool that speaks REST. HubSpot, Salesforce, Zapier, Klaviyo, Mailchimp, and Brevo all connect out of the box.

Verifox also ships native MCP server support so AI agents (Claude, Cursor, custom LLM apps) can validate addresses without glue code. Drop the MCP URL into your agent config and the tools are wired.

Speed depends on the mail servers behind your list, because every row waits for a real answer. Slow domains take longer than fast ones.

Custom SLAs are available on an annual Volume contract, with live status at status.verifox.ai and integration details in the API docs.