Email Verification That Stops You Paying for Dead Inboxes.

Email verification is the process of confirming that an email address exists and can safely receive mail before you send to it. A verifier checks the address syntax, the domain’s MX records, and the mailbox itself over SMTP, then screens for disposable domains, role accounts, and catch-all servers. Instead of guessing, you get a verdict: Valid, Risky, or Invalid.

Verifox runs 9 checks on every address, including an AI confidence pass on catch-all domains and SPF, DKIM, and DMARC authentication. The full breakdown lives on the email verification service page, or you can test an address free right now.

ZeroBounce runs 4 checks. We run 9, and the five they skip are the ones that decide whether a B2B list is usable: catch-all detection with an AI confidence pass, domain age, and SPF, DKIM, and DMARC authentication.

The gap shows on catch-all domains, where 20-40% of B2B lists live and 4-check tools shrug with “unknown.” Run the same address through both engines and compare; the free email checker needs no signup.

4 per day with no account on the free email checker. Create a free account and you get 1,000 credits on the spot, or 2,500 if you sign up with a work email. No card either way.

Past that, credits are pay-as-you-go with volume pricing shown for your region. And if you need to find an address before you can verify it, the email finder is part of the same platform.

Catch-all domains accept mail for every address, valid or not, so a standard SMTP check can’t tell you whether a specific mailbox exists. Most tools stop there and return “unknown.”

Our AI runs a second-pass confidence analysis on those addresses and returns a real verdict: Valid, Risky, or Invalid. It’s the hardest part of our email verification service, and the reason catch-all-heavy lists come back usable instead of half gray.

Median latency is around 380ms for a single address, and most verdicts land within 2 seconds even when a slow mail server drags out the SMTP conversation. Bulk lists process at roughly 10,000 emails per minute.

Endpoint shapes, rate limits, and code samples live in the API docs.

Yes. The real-time endpoint is built for signup flows: block disposable domains, role accounts, and dead mailboxes the moment someone types an address. At a median of ~380ms, it runs inline without making your form feel slow.

Wiring it up is one endpoint call; the API docs walk through it.

Never. Buy once, use whenever, even years later. Credits stay on your account permanently: no monthly minimums, no use-it-or-lose-it pressure. The pricing page shows the volume tiers for your region.

We verify, not store. Addresses are processed in memory and discarded the moment verification completes. Nothing is retained, logged, or sold, and the platform is SOC 2 Type II compliant.

Yes, natively. Verifox ships an email verification MCP server, so Claude, Cursor, and custom LLM agents can verify addresses without glue code. Drop the MCP URL into your agent config and the tools are wired.

Prefer to call the engine directly? Everything the MCP exposes is also available over the REST API, documented in the API docs.