The Catch All Email Checker That Scores, Not Just Flags.

A catch-all email checker tells you whether a domain is set up to accept mail for every address, real mailbox or not. Those accept-all domains never bounce a fake address at the SMTP layer, so an ordinary verifier cannot prove a specific mailbox exists and returns a dead-end “unknown.”

Verifox goes one step further. Once we flag a domain as catch-all, an AI-confidence pass scores the individual address from 0 to 100 so you get a real signal to act on instead of a shrug. Want the textbook definition first? Read what a catch-all email is.

The engine sends a deterministic probe to a deliberately fake mailbox at the domain (something like [email protected]). If the receiving server returns the same 250 OK it returns for a real address, the domain is catch-all by definition: it accepts everything.

That probe is one of nine checks in the full verification engine, and it runs the moment the SMTP handshake completes. No third-party guess, just the server's own answer to a mailbox it could not possibly have.

On a catch-all domain a plain verifier stops at “unknown” because the server will not confirm or deny a mailbox. Verifox returns a 0-100 confidence scoreinstead, derived from signals the accept-all wall does not hide: the domain's sending patterns, the address format the company actually uses, role-prefix flags, and historical deliverability for that domain.

The result is an answer you can route on. High-confidence addresses go to your A list, low-confidence ones go to a slower nurture or get dropped. It is the same scoring our email verification service runs on every paid check.

Yes. You can run 4 catch-all checks per day from this page without an account. No card, no signup.

Create a free account and you get 1,000 checks 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.

Paste any address at the domain, even a guess like [email protected]. The accept-all probe runs against the domain's mail server, not the mailbox, so the catch-all verdict you get back applies to every address at that domain. The 0-100 confidence score is the only part that is specific to the exact address you pasted.

For lists, the same logic runs in bulk: upload a CSV or call the API and every row comes back tagged catch-all or not, each with its own score. If you only need a one-off deliverability read, the free email checker runs the identical engine.

Sometimes. Catch-all does not mean fake, it means unproven at the SMTP layer. Plenty of real companies run accept-all on purpose. The danger is that a catch-all domain will also silently accept addresses that have no mailbox behind them, and those turn into hard bounces that dent your sender reputation.

That is exactly why the confidence score matters: it separates the catch-all addresses that are probably real from the ones that probably are not, so you are not forced to either skip the whole domain or gamble your deliverability on it. Before any send, it pays to verify the rest of your list the same way.

Same engine as the paid plans. 99.99% accuracy on a 1,000-address benchmark list, including accept-all domains, where 20 to 40% of B2B email lists actually fail.

The free tier does not trade accuracy for the price tag. It caps volume only. Every catch-all check the paid Email Verification API runs is the same check the free catch all email checker on this page runs.

No. The address you paste is processed in memory and discarded the moment the verdict returns. The probe itself never sends a message either: it stops at the SMTP handshake, asks the server about a fake mailbox, and hangs up, so nothing lands in anyone's inbox and nothing identifies you to the target domain.

We're SOC 2 Type II compliant with the full Trust Center report on request. The privacy policy spells out exactly what the engine touches during a catch-all check and what it never keeps.

Yes. The REST API reference documents the inbound and outbound shapes for every endpoint, so the catch-all verdict and confidence score drop straight 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 score catch-all addresses without glue code. Drop the MCP URL into your agent config and the tools are wired.

Barely. The accept-all probe rides the same SMTP handshake the mailbox check already opens, so a full verdict still lands around a 380 msmedian. Once a domain's catch-all status is known, repeat checks against it come back sub-50 ms from cache, which is why scanning a list that clusters on a few company domains feels instant after the first hit.

Bulk runs hold roughly 10,000 emails per minute on the standard tier with the probe included on every row. SLA is 99.9% uptime on Starter, 99.99% with an annual Volume contract, with live history at status.verifox.ai and implementation details in the API docs.