Guerrilla Mail

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What Guerrilla Mail is

Guerrilla Mail is a freemium disposable-email service available through the web and an API. Users can obtain an address without registration or choose a custom address, helping separate less-trusted signups from a real inbox. Incoming messages remain for one hour after delivery or until deleted. Anyone who knows an Inbox ID may access that inbox, although the maker says a scrambled address can add privacy. The website uses HTTPS encryption. A public JSON API is available over HTTP and may be rate limited without published limits; API email display filters HTML and blocks images by default. The maker says logs are normally off, while data from obvious spam may support anti-abuse research. A password manager generates different site passwords from a domain and master passphrase. The free plan is complemented by a custom-domain plan costing $9.99 a year.

Who it suits

Guerrilla Mail suits people needing disposable addresses for parties they do not trust. Webmasters can also use it to check whether their sites send email correctly.

What it does well

Free plan available
No registration required for an address
Custom addresses and domains supported
Public JSON API available
Includes a password manager

What to know first

Inbox messages last only one hour
Anyone knowing an Inbox ID may access it
API rate limits are unpublished
Custom domain costs $9.99 a year

Limits

The free service keeps incoming messages for one hour after delivery or until deletion. The API may be rate limited, and the custom-domain option costs $9.99 a year.

Plans

Plan	Billed and limits	Price
Free	Disposable inbox · no registration · messages deleted after 1 hour	Free
Custom domain	$9.99 USD / year · Use a domain you own · incoming mail accessible only to you or everyone	$9.99 a year

As guerrillamail.com lists them, read 14 Oct 2026. The maker's own page has the final word.

Getting started

Open the Guerrilla Mail website
Choose a generated address or enter your own
Use the address for a signup or email check
Access messages in the web inbox or through the JSON API
Select the custom-domain plan if you want to use a domain you own

Verdict

Guerrilla Mail provides short-lived disposable inboxes, custom addresses, API access and a free plan. Users should understand the Inbox ID access warning and the limited message lifetime before relying on it.

Questions

Is Guerrilla Mail free?

Yes. A free plan is available. A custom-domain plan costs $9.99 a year.

Do I need to register?

No. The service provides a disposable address without requiring registration, and you can choose your own address.

Which platforms are supported?

Guerrilla Mail is available on the web and through an API.

How long are emails kept?

Incoming email is kept for one hour after delivery or until you delete it.

Is there an API?

Yes. A public JSON API over HTTP is available, though it may be rate limited.

Can I use a custom domain?

Yes. The Custom domain plan supports a domain you own for $9.99 a year.

Facts from Guerrilla Mail's own pages

Android app: Google Play lists Guerrilla Mail Throwaway Email with instant address generation, no registration, auto-refresh and multiple inboxes. · play.google.com, 14 Oct 2026
API: A public JSON API over HTTP is available, and the maker says it may be rate limited without publishing its rate limits. · guerrillamail.com, 3 Oct 2026
API availability: A public JSON API is available to all users over HTTP at api.guerrillamail.com/ajax.php. · guerrillamail.com, 14 Oct 2026
API clients: The maker describes the API as usable for Android, iPhone/iPad, Facebook and other custom applications. · guerrillamail.com, 14 Oct 2026
API limits: The API documentation warns that requests may be rate limited but does not publish rate-limit values. · guerrillamail.com, 14 Oct 2026
API operations: Documented API functions include address creation, inbox polling, message retrieval, address changes, deletion, forgetting an address and extending time. · guerrillamail.com, 14 Oct 2026
Chrome extension: The Chrome extension offers disposable-mail creation and inbox viewing without leaving the current page. · chromewebstore.google.com, 14 Oct 2026
Company incorporation: Jamit Software Limited is listed as a Hong Kong private company incorporated on February 29, 2008. · 996co.com, 14 Oct 2026
Data research: The maker may use anonymized data from obvious spam for anti-spam, anti-malware or anti-phishing research. · guerrillamail.com, 14 Oct 2026
Disposable email: The service provides a disposable email address without requiring registration, and users can also choose their own address. · guerrillamail.com, 3 Oct 2026
Documentation depth: The Read the Docs reference documents address generation, message listing, polling, retrieval, address changes, forgetting and deletion. · guerrillamail.readthedocs.io, 14 Oct 2026
Email rendering: The API documentation says HTML in email bodies is filtered and images are blocked by default when displayed. · guerrillamail.com, 3 Oct 2026
Email retention: Incoming email is kept for one hour after delivery to an inbox, or until the user deletes it. · guerrillamail.com, 3 Oct 2026
Encryption: The website can only be accessed using HTTPS encryption. · guerrillamail.com, 3 Oct 2026
HTTPS: The website states that it can only be accessed through HTTPS encryption. · guerrillamail.com, 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. · guerrillamail.com, 3 Oct 2026
Inbox access risk: Anyone who knows an inbox ID can access that inbox because accounts do not require registration. · guerrillamail.com, 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. · guerrillamail.com, 3 Oct 2026
Limit: advertising and dated UI: The 2026 review characterized the interface as ad-heavy and dated compared with newer services. · tempemail.cc, 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. · tempemail.cc, 14 Oct 2026
Limit: organization: TechRadar found the service has limited organization features. · techradar.com, 14 Oct 2026
Limit: sending outage: A 2026 hands-on review reported that sending returned a message saying it was suspended for the day. · tempemail.cc, 14 Oct 2026
Limit: shared inbox exposure: TechRadar warned that anyone who obtains an address can access its inbox. · techradar.com, 14 Oct 2026
Maker identity: The Guerrilla Mail site identifies Jamit Software Limited as its copyright holder and operator. · guerrillamail.com, 14 Oct 2026