MailKite Server
The facts below are what the maker publishes about MailKite Server, checked and dated. Our editors have not written about it yet.
Plans and prices
From MailKite Server's own pricing page, checked 11 Oct 2026.
| Plan | Price | What it gives you |
|---|---|---|
| MailKite Server (AGPL-3.0) | Free | Open-source server; runs on Node.js ≥ 22.5; self-hosted |
The facts
Each one read from MailKite Server's own pages, with the date it was checked.
What it does
- API
- The self-hosted API supports JSON send and receive through /v1/send, /v1/send/batch, /v1/me, and /api/messages.checked 11 Oct 2026
- API limits
- The maker says templates, scheduling, attachments, tracking, and other hosted-only features are not yet part of the self-hosted API surface.checked 11 Oct 2026
- Backend
- The reference backend is one Node process using node:sqlite with zero npm dependencies.checked 11 Oct 2026
- Components
- The stack includes Haraka SMTP MX and submission edges, an IMAP server, a SQLite reference backend, and a web console.checked 11 Oct 2026
- Deployment
- The project says it runs on Node.js 22.5 or later and documents Docker Compose, VPS, Fly.io, and Railway deployments.checked 11 Oct 2026
- IMAP
- The IMAP4 server uses implicit TLS on port 993 and is described as read-mostly INBOX and Sent.checked 11 Oct 2026
- IMAP limitations
- The maker describes its IMAP support as read-mostly INBOX and Sent, without full IMAP or JMAP features such as folders, server-side rules, and ManageSieve.checked 11 Oct 2026
- Inbound delivery
- Inbound messages can be delivered to the backend as signed webhooks with retries, or accessed through REST or IMAP.checked 11 Oct 2026
- Inbound mail
- The MX edge checks recipients and sends raw messages to the backend as signed webhooks.checked 11 Oct 2026
- Integrations
- MailKite lists official SDKs for Node.js, Python, Ruby, Go, PHP, Java, C#, and Rust, plus a CLI, an MCP server, and SMTP relay integrations.checked 11 Oct 2026
- Intended use
- The project is aimed at getting email into application code; its page says it is not intended as a full human mailbox service with webmail, calendars, and quotas.checked 11 Oct 2026
- License
- The server components are licensed under AGPL-3.0.checked 11 Oct 2026
- Notable limits
- The self-hosted API does not yet claim full Cloud API parity; templates, scheduling, attachments, and tracking are listed as hosted-only features.checked 11 Oct 2026
- Outbound mail
- The submission edge supports SMTP AUTH on ports 587 and 465 and signs mail with DKIM.checked 11 Oct 2026
- Purpose
- MailKite Server is an open-source email server for apps and AI agents.checked 11 Oct 2026
- SDKs
- The official Node or TypeScript client can target a self-hosted server by setting its base URL.checked 11 Oct 2026
- Security
- Server components use HMAC-authenticated HTTP endpoints, and inbound webhook deliveries are signed and retried.checked 11 Oct 2026
- Storage and dependencies
- The reference backend uses Node’s built-in SQLite module and has zero npm dependencies.checked 11 Oct 2026
- Support
- The self-hosted server page directs users to GitHub discussions and setup documentation; it describes human support as a MailKite Cloud offering.checked 11 Oct 2026
- Use case
- The maker positions the server for getting email into application code and says it is not intended to provide human mailboxes with webmail, calendars, and quotas.checked 11 Oct 2026
The company
- Company
- MailKite is a business name of SendHub LLC, whose listed address is 30 N Gould St #59709, Sheridan, Wyoming 82801, USA.checked 11 Oct 2026
- Headquarters
- Sheridan, Wyoming, USAchecked 28 Sep 2026
- Maker
- The site identifies SendHub LLC, doing business as MailKite, and gives its address as 30 N Gould St #59709, Sheridan, WY 82801, USA.checked 11 Oct 2026
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