isDisposable vs Mailgun
Both detect disposable email addresses — but they solve different problems. isDisposable is an open-source library and API for blocking fake signups in real time. Mailgun Email Validation is a paid service focused on deliverability verification. Here's an honest breakdown.
What is Mailgun?
Mailgun Email Validation is an add-on to Mailgun's email-sending platform. It validates address syntax, MX records, and risk, and is most useful for teams already sending transactional or marketing mail through Mailgun.
Feature comparison
| Feature | isDisposable | Mailgun |
|---|---|---|
| Open source | ||
| Free tier | ||
| Offline / self-hosted check | ||
| No API key required (npm package) | ||
| Disposable / temporary email detection | ||
| Real-time MX / DNS checks | ||
| Full mailbox (SMTP) deliverability verification | ||
| Risk / confidence score | ||
| Bulk list cleaning |
full · partial · not available
Where isDisposable wins
- Not tied to any email-sending provider — works with any stack.
- Open-source package runs offline with no API key and no per-call cost.
- Purpose-built for disposable-email detection rather than send-time validation.
- Free to integrate; upgrade to the API only when you need live DNS checks.
Where Mailgun wins
- Tightly integrated with Mailgun's sending infrastructure.
- Risk grading designed to protect sender reputation.
- Single vendor if you already send email through Mailgun.
Which should you choose?
Choose Mailgun if you already send all your email through Mailgun and want validation from the same vendor.
Choose isDisposable if you want a provider-agnostic, open-source way to block disposable signups without adopting an email-sending platform. Many teams use both — isDisposable at the signup form, Mailgun for periodic list cleaning.
Try isDisposable in 60 seconds
npm install @isdisposable/jsimport { isDisposable } from '@isdisposable/js';
if (isDisposable(email)) {
throw new Error('Please use a permanent email address');
}Frequently asked questions
Is isDisposable a free alternative to Mailgun?
Yes. isDisposable is open source. The npm and PyPI packages bundle 160,073+ disposable domains and run offline for free. A paid API tier adds live DNS checks and scoring, with a free plan to start.
What does Mailgun do that isDisposable does not?
Tightly integrated with Mailgun's sending infrastructure.
Should I switch from Mailgun to isDisposable?
If your goal is blocking disposable and fake signups, you want a provider-agnostic, open-source way to block disposable signups without adopting an email-sending platform. If you already send all your email through Mailgun and want validation from the same vendor., Mailgun remains a strong fit — the two tools also work well together.
Start blocking disposable signups
Free, open-source, and live in one line of code.