You shouldn’t need an account, a credit card, or an API key just to answer “is this one email address real?” So we pulled four pieces of RocketVerifier’s detection engine out from behind the login wall and put them on the site as free, no-signup browser tools. Fair-use limits apply — the free Email Verifier is capped at 2 checks per day per visitor, while the disposable, MX, and domain-auth lookups are open more generously since they’re cheap DNS-only checks.
Here’s what’s live on the new tools hub:
1. Free Email Verifier
The Free Email Verifier checks syntax validity and DNS/MX records for any address in seconds. It’s the fast, no-cost version of what full verification does — it won’t confirm the mailbox actually accepts mail (that requires a live SMTP handshake, which is what the paid API does), but it will instantly catch typos, malformed addresses, and domains with no mail server at all.
2. Disposable Email Checker
Temporary inboxes from Mailinator, Yopmail, and hundreds of similar services are a constant source of fake signups. The Disposable Email Checker checks any address or domain against our continuously updated list of known disposable providers, so you can filter them out of a signup flow before they ever hit your database.
3. MX Lookup
The MX Lookup tool does exactly what it says: enter a domain, get back its MX records in priority order. Useful for quickly confirming a domain can receive mail at all — a surprising number of “typo” domains have zero MX records and would bounce every single message.
4. Email Deliverability Checker
The most requested tool by far. The Email Deliverability Checker scores a domain’s SPF, DKIM, and DMARC configuration and gives you concrete recommendations for what’s missing or misconfigured. If your cold outreach or transactional email is landing in spam, this is usually the first place to look — and it takes about three seconds to check.
Why give this away for free
Two reasons. First, syntax/DNS checks and authentication scoring are a small fraction of what goes into full email verification — the expensive part (and the part we charge credits for) is the live SMTP handshake that confirms a mailbox actually exists and accepts mail. Giving away the cheap-to-compute layer costs us very little and saves you a trip through a signup form for a quick check.
Second, we’d simply rather you use RocketVerifier for the quick stuff and come back when you need the real thing — bulk lists, live mailbox confirmation, a proper confidence score — than have you never try the product at all.
Prefer to script it?
All four tools are also exposed as free MCP tools (check_disposable, mx_lookup, check_domain_auth) in our new MCP server, so you can call them directly from Claude, Cursor, or ChatGPT without opening a browser tab.
Need the full thing?
When you’re ready for live SMTP verification with a confidence score — the check that actually confirms a mailbox exists — sign up free for 100 credits, no credit card required.