Disposable Email Detector

Check a list of email addresses or bare domains against a built-in list of ~150 well-known disposable and temporary email providers. Paste one per line, click Check, and get a per-row verdict — useful for cleaning registration lists or validating leads without any API calls.

How to use the Disposable Email Detector

Paste email addresses or bare domain names into the text area — one per line. Mixed lists are fine (you can combine [email protected] entries with bare domain.com entries). Click Check to run the detection.

For each input the tool extracts the domain (everything after the last @, or the whole line if no @ is present), lowercases it, and looks it up in the built-in disposable-domain list. The results table shows the original input, the extracted domain, and a Disposable? verdict. A summary count shows how many disposable addresses were found.

This tool works entirely in your browser — nothing is sent to a server. Note that the built-in list covers ~150 well-known providers and is not exhaustive; new throwaway services appear constantly. For production use-cases (sign-up forms, CRM hygiene), consider augmenting this with a regularly-updated blocklist API.

What are disposable email addresses?

Disposable (or throwaway) email addresses are temporary inboxes that anyone can create in seconds — no registration, no password — and use once to bypass email verification. Services like Mailinator, Guerrilla Mail, and 10 Minute Mail provide public inboxes accessible by anyone who knows the address. Others like temp-mail.org provide private random addresses that expire after a short time. From a developer's perspective these addresses look syntactically valid and will pass RFC 5322 format checks, but they are almost always associated with low-quality signups, fraudulent accounts, or trial abuse.

The practical impact is significant: marketing metrics are skewed, free-trial quotas are abused, and spam traps embedded in these services can damage sender reputation if you email them at scale. Detecting and blocking disposable addresses at registration time or during list hygiene is a standard practice for SaaS products, e-commerce platforms, and any service where email deliverability matters.

Detection works by maintaining a blocklist of known provider domains. The challenge is that the list changes constantly — new providers emerge weekly and some operate under dozens of subdomains. A static list like the one baked into this tool catches the majority of common providers, but a production system should pair it with a live API (such as Abstract's email validation or open-source blocklists like disposable-email-domains on GitHub) that is updated continuously.

Common use cases

  • Sign-up form validation — Block throwaway addresses at registration to reduce trial abuse and improve the quality of your user base.
  • CRM list hygiene — Audit an export of email leads to identify and remove disposable addresses before an email campaign.
  • Lead scoring — Flag contacts with disposable domains as low-quality so sales teams can prioritize genuine inquiries.
  • Fraud prevention — Detect multi-account creation attempts where users cycle through temp-mail addresses to claim multiple free trials.
  • Developer testing — Quickly check whether a set of test addresses you plan to use would be blocked by a disposable-email detector in your own system.

Frequently asked questions

Is the list comprehensive?
No. The built-in list covers approximately 150 well-known providers but new disposable services appear constantly. It will catch the vast majority of common throwaway addresses. For production systems that need high recall, use an actively maintained blocklist or a paid API.

Does the tool check if an address actually exists?
No. This tool only checks whether the domain is a known disposable provider. It does not perform SMTP verification or DNS MX lookups. An address could be from a real domain but still non-existent.

Can a legitimate user have a disposable-domain address?
Rarely, but theoretically yes — someone might use a privacy relay service that routes to a real inbox. Treat the result as a risk signal, not a certainty, especially for existing customers.

How do I block these in my own sign-up form?
Maintain a blocklist of domains (or use a library like disposable-email-domains on npm/packagist), extract the domain from the submitted email, and reject it if it matches. Run the check server-side so it cannot be bypassed by JavaScript.

What about catch-all addresses like [email protected] or [email protected]?
Privacy relay services (Apple Hide My Email, ProtonMail aliases, DuckDuckGo email protection) are not disposable in the traditional sense — they route to a real inbox owned by the user. They are not included in this list.