Disposable Email Checker
Paste an email address, then click Check. Blocklist covers 5739+ known disposable domains — runs locally in your browser.
Checks run locally — no email is uploaded. Blocklist includes 5,739 known disposable domains. View full blocklist. A domain not on the list may still be disposable; suspicious heuristics flag common temp-mail name patterns only.
How to use
- Paste one email or one address per line — input starts empty; nothing runs until you click Check.
- Review Disposable (blocklist match), Suspicious (name heuristic), OK, or Invalid rows.
- For bulk lists, use Copy disposable or Copy OK to export filtered addresses.
FAQ
How does this detect disposable email?
The domain is matched against a curated blocklist of known temporary mail hosts (Mailinator, Guerrilla Mail, 10MinuteMail, YOPmail, etc.). Domains with common temp-mail name patterns may be flagged Suspicious even if not on the list.
Is my email list uploaded?
No. The blocklist and checks run entirely in your browser when you click Check.
Can a legitimate domain be flagged?
Rarely — Suspicious is heuristic only. OK means not on our blocklist, not a guarantee the address is permanent or owned by the user.
Does this replace Email Validator?
No. Use Email Validator for syntax and optional MX. This tool focuses on throwaway domain detection for signup abuse prevention.
Why check on button click only?
So large pasted lists are scanned once when you are ready, not on every keystroke.
Introduction
A disposable email checker helps you block temporary mail addresses at signup, trial activation, or lead capture. Services like Mailinator, Guerrilla Mail, and YOPmail let users create inboxes in seconds — fine for testing, risky for accounts you need to recover or market to later.
This tool compares the email domain against a local blocklist of known disposable hosts. Checks run in your browser when you click Check — nothing is uploaded.
What gets flagged?
| Status | Meaning |
|---|---|
| Disposable | Domain is on the blocklist (or a subdomain of a listed host). |
| Suspicious | Domain name matches common temp-mail patterns but is not on the list — review manually. |
| OK | Not on the blocklist (does not prove the user owns a real inbox). |
| Invalid | Email format failed — fix syntax first. |
The blocklist covers hundreds of well-known throwaway providers. New domains appear daily; combine this with rate limits and verification for high-value flows.
Key Features
- 5,700+ domain blocklist from
data/disposable_email_blocklist— bundled locally, no external API for the check itself. - Single email or bulk (one per line) with summary counts.
- Copy disposable / Copy OK for import filtering.
- Sample button for demo addresses; empty input on load.
- Reuses format validation from Email Validator before domain matching.
Common Use Cases
- Filtering newsletter or free-trial signups before CRM import.
- QA-testing your own signup form’s disposable blocking rules.
- Cleaning scraped lead lists before outreach (respect opt-in law).
- Pairing with MX Lookup when you also care about mail routing.
Best Practices
- Browse the full blocklist to search or download all known disposable domains.
- Treat OK as “not on our list,” not “verified human” — add OTP or double opt-in for important accounts.
- Review Suspicious rows; heuristics can miss new brands or rarely flag odd legitimate names.
- Update the blocklist in
data/disposable_email_blocklist, then runnpm run disposable-blocklist:sync(also runs beforenpm run build). - Block disposable at registration, not only at send time, to reduce fake account load.
- For deliverability and syntax, still use Email Validator; for auth DNS, use SPF / DMARC tools separately.