Disposable Email & Domain Checker
Instantly verify whether an email address or domain name is a temporary, throwaway burner service. Checked against our live database of 100,000+ providers.
Why You Must Block Temporary Email Providers
Burner emails are designed to bypass forms without accountability. Accepting them causes severe product and deliverability decay:
Free-Trial & Promo Abuse
Serial churners and bots use burner inboxes to repeatedly claim introductory credits, free API quotas, and SaaS trial accounts without ever converting to paid users.
Skewed Product Analytics
Temporary addresses distort your acquisition metrics. They create phantom user sign-ups that decimate your onboarding open rates, active user ratios, and LTV calculations.
Delayed Hard Bounces
Once the temporary mailbox expires (often within hours), transactional receipts and follow-up emails permanently bounce, threatening your Google and Yahoo sender score.
Free Disposable Tool vs. Full NullBounce Platform
Understand what this lightweight lookup checks versus our comprehensive deliverability engine.
| Verification Feature | This Free Tool | Full Platform (Bulk/API) |
|---|---|---|
| 100,000+ Disposable Domains Lookup | ✓ Included | ✓ Included |
| Input Format Supported | 1 Email or Domain | CSV, TXT, or REST API |
| Live DNS & MX Records Inspection | ✕ No | ✓ Included |
| SMTP Handshake (Mailbox Existence) | ✕ No | ✓ Included |
| Catch-All & Role Account Isolation | ✕ No | ✓ Included |
| Bulk Upload (Up to 100,000+ rows) | ✕ No | ✓ Included |
Common Temporary Email Providers We Track
A sample of active burner networks continuously monitored and cataloged in our 100,000+ domain database.
| Service Name | Primary Domains | Inbox Lifespan | Operating Architecture |
|---|---|---|---|
| Mailinator | mailinator.com (+ rotating aliases) | Few hours | Publicly readable mailboxes; accepts messages for any username automatically. |
| 10MinuteMail | 10minutemail.com | 10 – 20 minutes | Hard countdown timer. Decommissions address and wipes all records upon expiration. |
| Temp-Mail | temp-mail.org (+ 100s of cheap TLDs) | 1 – 24 hours | High domain velocity. Uses short-lived domains to bypass static blacklist files. |
| Guerrilla Mail | guerrillamail.com, sharklasers.com | 60 minutes | Disposable inbox with scramble addresses to disguise user identity from senders. |
Why Static GitHub Blocklists Fail in Production
Many engineering teams initially attempt to block disposable emails by embedding open-source blocklists (static .txt or .json files found on GitHub) directly into their application code. While this stops well-known legacy domains like mailinator.com, it quickly fails against modern abusive traffic.
Modern burner email operators purchase newly registered, low-cost generic top-level domains (such as .xyz, .top, .icu, and .site) in bulk. They rotate their primary receiving domains on a weekly or daily basis. A static list downloaded today becomes blind to roughly 15% of active disposable domains within 30 days.
Furthermore, disposable domains maintain fully valid, operational MX records. They are intentionally designed to pass standard DNS checks so that confirmation links and OTP passwords arrive successfully during the initial sign-up window. Blocking them requires live, constantly refreshed intelligence rather than static pattern matching.
Need to Clean an Entire Database of Contacts?
This free online tool checks one domain at a time. If you have an exported CSV or Excel database with thousands of leads, use our bulk list cleaning engine to purge all disposable, dead, and invalid mailboxes at once.
📁 Learn About Bulk CSV Verification →Disposable Email Checker: FAQ
Answers to common questions about temporary email detection.
Can I check just a domain name without an email prefix?
Yes. You can enter either a full email address (e.g., test@mailinator.com) or simply the naked domain (e.g., mailinator.com). Our tool automatically extracts the domain and checks it against our database.
Does this tool send an email to the checked address?
No. This lookup performs a high-speed database query against known burner domains. No SMTP connection is made to the destination server, and no message is ever sent.
How often is the disposable domain database updated?
Our threat intelligence database is continuously refreshed with new burner and temporary domains to prevent spammers from bypassing blocklists using newly registered cheap TLDs (.xyz, .top, .site).
What is the difference between a disposable email and a free email?
Free emails (like Gmail, Yahoo, or Outlook) are permanent personal accounts managed by reputable providers. Disposable emails are short-lived, anonymous mailboxes created solely to bypass forms. For an in-depth breakdown, read our Disposable Email Guide.
Clean Out Burner Domains from Your Database
Sign up today and get 100 free credits. Clean your CSV lists or grab an API key to block disposable emails automatically.
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