Guerrilla Mail
Guerrilla Mail is a disposable email service available on the web and through an API.
What Guerrilla Mail is
Guerrilla Mail is a disposable email service available on the web and through an API. It gives you an address without registration, and you can choose a custom address. Incoming messages remain for one hour after delivery or until deleted. The service is intended for contact with parties you do not trust and for webmasters checking whether their sites deliver email. Anyone who knows an Inbox ID can open that inbox, although the maker says a scrambled address can add privacy. The website requires HTTPS, while its public JSON API is described as HTTP-based and may be rate limited without published limits. API display filters HTML and blocks images by default. The maker says logs are normally off, but data from obvious spam may support anti-spam, anti-malware, or anti-phishing research. A password manager creates different site passwords from a domain and master passphrase. A free plan is available; custom domains cost $9.99 a year.
Good
- No registration required for an address
- Custom addresses and domains supported
- Incoming mail lasts one hour
- Public JSON API available
- Password manager included
Watch out
- Anyone with the Inbox ID may access it
- Messages are retained only for one hour
- API rate limits are unpublished
- Support may not always reply
Who it suits
It suits people needing temporary addresses for less-trusted signups and webmasters checking mail delivery. It also fits users who need API access or custom domains.
Verdict
Guerrilla Mail focuses on short-lived, disposable inboxes with web and API access. Check the Inbox ID privacy limitation and brief retention before using it for sensitive mail.
Plans and prices
From Guerrilla Mail's own pricing page, checked 14 Oct 2026.
| Plan | Price | What it gives you |
|---|---|---|
| Free | Free | Disposable inbox · no registration · messages deleted after 1 hour |
| Custom domain | $9.99 a year | Use a domain you own · incoming mail accessible only to you or everyone · $9.99 USD / year |
The facts
Each one read from Guerrilla Mail's own pages, with the date it was checked.
Where it runs
- Android app
- Google Play lists Guerrilla Mail Throwaway Email with instant address generation, no registration, auto-refresh and multiple inboxes.checked 14 Oct 2026
What it does
- API
- A public JSON API over HTTP is available, and the maker says it may be rate limited without publishing its rate limits.checked 3 Oct 2026
- API availability
- A public JSON API is available to all users over HTTP at api.guerrillamail.com/ajax.php.checked 14 Oct 2026
- API clients
- The maker describes the API as usable for Android, iPhone/iPad, Facebook and other custom applications.checked 14 Oct 2026
- API limits
- The API documentation warns that requests may be rate limited but does not publish rate-limit values.checked 14 Oct 2026
- API operations
- Documented API functions include address creation, inbox polling, message retrieval, address changes, deletion, forgetting an address and extending time.checked 14 Oct 2026
- Chrome extension
- The Chrome extension offers disposable-mail creation and inbox viewing without leaving the current page.checked 14 Oct 2026
- Data research
- The maker may use anonymized data from obvious spam for anti-spam, anti-malware or anti-phishing research.checked 14 Oct 2026
- Disposable email
- The service provides a disposable email address without requiring registration, and users can also choose their own address.checked 3 Oct 2026
- Documentation depth
- The Read the Docs reference documents address generation, message listing, polling, retrieval, address changes, forgetting and deletion.checked 14 Oct 2026
- Email rendering
- The API documentation says HTML in email bodies is filtered and images are blocked by default when displayed.checked 3 Oct 2026
- Email retention
- Incoming email is kept for one hour after delivery to an inbox, or until the user deletes it.checked 3 Oct 2026
- Encryption
- The website can only be accessed using HTTPS encryption.checked 3 Oct 2026
- HTTPS
- The website states that it can only be accessed through HTTPS encryption.checked 14 Oct 2026
- Inbox access
- Anyone who knows an Inbox ID may access its inbox; the maker says a scrambled address can provide additional privacy.checked 3 Oct 2026
- Inbox access risk
- Anyone who knows an inbox ID can access that inbox because accounts do not require registration.checked 14 Oct 2026
- Intended use
- The maker suggests the service for using an address with parties a user does not trust and for webmasters checking whether their sites send email correctly.checked 3 Oct 2026
- Limit: advertising and dated UI
- The 2026 review characterized the interface as ad-heavy and dated compared with newer services.checked 14 Oct 2026
- Limit: blocked signups
- The same review reported that Discord, Reddit, Cloudflare and Netflix rejected Guerrilla Mail addresses while smaller forums accepted them.checked 14 Oct 2026
- Limit: organization
- TechRadar found the service has limited organization features.checked 14 Oct 2026
- Limit: sending outage
- A 2026 hands-on review reported that sending returned a message saying it was suspended for the day.checked 14 Oct 2026
- Limit: shared inbox exposure
- TechRadar warned that anyone who obtains an address can access its inbox.checked 14 Oct 2026
The company
- Company incorporation
- Jamit Software Limited is listed as a Hong Kong private company incorporated on February 29, 2008.checked 14 Oct 2026
- Maker identity
- The Guerrilla Mail site identifies Jamit Software Limited as its copyright holder and operator.checked 14 Oct 2026
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