The Email Deliverability Tester That Catches Bounces.

Yes. You can test 4 addresses per day for deliverability from this page without an account. No card, no signup.

Create a free account and you get 1,000 tests on the spot, or 2,500 if your signup email is a work address. After that, credits are pay-as-you-go and never expire on any paid plan, with volume pricing shown for your region. If you hit the daily cap while anonymous, you can either wait 24 hours or claim those signup credits instantly, no card required for that tier either.

Nine checks run in parallel on every test: syntax and format validation (RFC 5321 / 5322), domain existence and MX-record presence, the SMTP handshake and mailbox-exists ping, disposable-domain match, role-address detection, catch-all domain detection, domain-age scoring, email authentication signals (SPF, DKIM, DMARC), and an AI-confidence pass on catch-all addresses.

The MX + SMTP pair confirms the domain can receive mail and the specific mailbox is live — a deliverability verdict before you send.

No, and that is on purpose. This tool tests address-level deliverability: whether a mailbox exists, is live, and will accept mail, or whether it is dead and will bounce. It does not run a seed-list send, score your message content, or report which folder you land in.

Inbox placement depends on your sending domain, your reputation, and the message itself. Cleaning out undeliverable addresses first is the foundation that makes the rest of your deliverability work pay off.

A bounce is just the receiving server telling you, after the fact, that an address is dead. The deliverability test runs the exact MX lookup and SMTP handshake that server would, without delivering anything, so you get that verdict before the send instead of as a failure report after.

Addresses come back as deliverable, undeliverable, or risky with a confidence score. If your angle is specifically bounce prevention on a send, the email bounce checker frames the same engine around hard-bounce risk.

Same engine as the paid plans. 99.99% accuracy on a 1,000-address benchmark list, including catch-all domains.

The free tier doesn't trade accuracy for the price tag. It caps volume only. Every check the paid Email Verification API runs to judge deliverability is the same check the tester on this page runs.

Yes. The free tier gives you 1,000 tests (2,500 if you sign up with a work email), so you can run a deliverability check across most small lists outright before a send.

For larger lists, our paid credit packs are pay-as-you-go and never expire, with pricing localized to your region on the pricing page. CSV upload, API access, and bulk parallel processing are included from the free tier up.

On the address level, you want effectively all mailboxes on your list to be live before you send. Mailbox providers start throttling once hard bounces cross roughly 2%, so the practical target is under 1% undeliverable.

Testing deliverability up front is the cheapest way to protect the sender reputation that every later send depends on. Pair it with a blacklist check to cover the domain-reputation side of the deliverability picture too.

No. Addresses are processed in memory and discarded the moment the deliverability test completes. Nothing logged, nothing retained, nothing sold.

We're SOC 2 Type II compliant with the full Trust Center report on request. Read the privacy policy for the byte-by-byte breakdown of what we touch and what we don't.

A single-address deliverability test returns its verdict in about 380 ms at the median, and sub-50 ms when cached, fast enough to gate a signup form on the live verdict. Bulk testing runs at roughly 10,000 emails per minute on the standard tier.

SLA is 99.9% uptime on Starter, 99.99% with an annual Volume contract. Implementation details are in the API docs, and live uptime + incident history are tracked at status.verifox.ai in real time.

Yes. The REST API reference documents the inbound and outbound shapes for every endpoint, so you can drop real-time deliverability testing 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 test deliverability without glue code. Drop the MCP URL into your agent config and the tools are wired.