8-Signal Verification Engine
Every address is run through eight independent checks - syntax, MX, SPF/DKIM/DMARC, disposable domains, blacklists, and domain age - and resolved into one 0-100 trust score. No signup. No API key. Checked locally, on your own server.
Checked locally on your own server by default - your visitors' emails never leave this site unless you turn on the optional cloud lookup.
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The Diagnostic Pipeline
Each signal narrows the verdict a little further. Nothing is a black box - every one of these is a real record read directly from the domain, not a guess.
Validates RFC syntax and catches common webmail typos - "gmial.com" → "gmail.com" - with a one-click fix.
Confirms the domain has a live mail server actually willing to accept mail.
Reads the raw authentication records for the domain, not just a pass/fail flag.
Flags throwaway inboxes and domains configured to silently accept anything.
Cross-checks the domain and IP against major public spam blacklists.
A domain registered yesterday scores differently than one that's been live for years.
Flags shared inboxes like info@ or support@ instead of a named person.
Every signal above resolves into one 0-100 number, with a valid / risky / invalid verdict.
The Toolkit
Drop the full checker into a page, or hand a client a single-purpose tool that works entirely on its own.
Full 8-signal check with a 0-100 trust score and one-click typo fixes.
Try it →Paste a document, CSV, or page source and pull out every address in it.
Try it →Confirms a domain can actually receive mail - see every server behind it.
Try it →Shows the actual raw authentication records for a domain - not just pass/fail.
Try it →Flags throwaway and catch-all domains before they land on your list.
Try it →Cross-references a domain, IP, or email against major public spam blacklists.
Try it →Catches malformed addresses and common webmail typos before a bounce happens.
Try it →Search a domain to see its category, industry, and trust score at a glance.
Try it →Who It's For
Don't know which tool you need yet? Find your team below.
Built for teams like these
For Developers & AI Agents
The same 8-signal engine is available as a REST API, documented with a full OpenAPI spec so scripts, no-code tools, and AI coding agents can discover every endpoint on their own - no key needed just to look. A sandbox key lets you build and test against realistic, instant mock responses before you ever touch a live key or your daily quota.
Every route documented and machine-discoverable at /openapi.json.
Give Claude, ChatGPT, or any MCP-speaking agent direct tool access - no copy-pasting results back and forth.
Build against instant mock responses - no daily quota spent, nothing recorded, while you're still testing.
Free to run, checked locally, live in one shortcode.
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