InboxKitten
InboxKitten: A self-hostable disposable inbox service for signup testing and temporary messages. Ranked #11 of 24 in Disposable Email Services by our editors (7.9/10); pricing: Free plan; best for open-source teams wanting self-hosted inboxes.
At a glance
- Editor score7.9 / 10
- PricingFree plan
- Best forOpen-source teams wanting self-hosted inboxes
- Free planYes
- Paid fromFree
- Inbox lifetimeDays
- Facts checked20 Sep 2026
Where it wins
- Open-source deployment with Docker or serverless options
- Custom inbox names with web and API access
- Integrates with Mailgun, Firebase, and Cloudflare Workers
Where it doesn't
- Hosted emails are public
- Messages are automatically deleted after a short retention period
- Not designed for sensitive or long-term email storage
Our verdict on InboxKitten
InboxKitten is an open-source disposable email service for application signup and notification testing, spam avoidance, and other non-critical messages. Users select an inbox name and view messages through a web interface, while developers can use the API and command-line components. It supports web, API, and self-hosted deployment, making it a fit for open-source teams that want control over how temporary inboxes are deployed and accessed.
Platform fit is a central strength. InboxKitten supports self-hosting with Docker or serverless deployment and provides integrations with Mailgun, Firebase, and Cloudflare Workers. Mailgun-backed retrieval supports the hosted and deployment workflows, while the API and CLI extend the service beyond browser-based inbox viewing. This combination suits teams testing signup flows across applications or embedding disposable inbox access into development workflows. The product remains focused on temporary email rather than broader communication or inbox management.
The published plans show an open-source pricing model with a free plan and a Self-Host plan for self-hosted InboxKitten deployment. Hosted emails are public and automatically deleted after several hours; the project documentation also describes a three-day Mailgun retention period. That makes InboxKitten appropriate for test messages, temporary access flows, and non-critical notifications, but not for confidential content or records that need long-term retention. Choose it when self-hosting, custom inbox names, and developer access matter more than private, persistent mailboxes; choose an alternative when messages need stronger confidentiality or durable storage.
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InboxKitten pricing
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InboxKitten fact sheet
| Free plan | Yes |
|---|---|
| Paid from | Free |
| Inbox lifetime | Days |
| Custom address | Yes |
| API access | Yes |
| Custom domain | Yes |
| Attachments supported | Not verified |
| Max active inboxes | Not verified |
| Deployment | Cloud, Self-hosted |
| Platforms | Web |
| Support | Community, Docs |
| Built for | Solo, Small business (editorial estimate) |
| Integrations | 3 integrations: Mailgun, Firebase, Cloudflare Workers |
| Pricing | Free plan (source) |
| Website | inboxkitten.com |
| Facts checked | 20 Sep 2026 |
InboxKitten integrations
InboxKitten lists 3 integrations on its own site.
- Mailgun
- Firebase
- Cloudflare Workers
Alternatives to InboxKitten
- MailinatorA strong fit for automated inbox testing, with private domains and API-driven workflows.9.2
- Temp Mail APIA developer-focused disposable email service with strong parsing and automation support.9.0
- SecureTempMailA flexible disposable inbox service with automation features and a developer plan.8.8
See all InboxKitten alternatives →
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Featured on iTechGuides
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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
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