MailKite Server

mailkite.dev · checked 11 Oct 2026

#5 · Email APIs

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How it plugs in

YesPublic API

NoOpen source

YesFree tier

Signal on Email APIs6.3#5 of 31

MailKite Server is an open-source email server for apps and AI agents.

Pricing

MailKite Server (AGPL-3.0)Open-source server; runs on Node.js ≥ 22.5; self-hostedFree

As mailkite.dev lists them, checked 11 Oct 2026.

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Facts

Website: mailkite.dev
Price: Free tier
Free trial: Not stated
API limits: The maker says templates, scheduling, attachments, tracking, and other hosted-only features are not yet part of the self-hosted API surface.
Backend: The reference backend is one Node process using node:sqlite with zero npm dependencies.
Company: MailKite is a business name of SendHub LLC, whose listed address is 30 N Gould St #59709, Sheridan, Wyoming 82801, USA.
Components: The stack includes Haraka SMTP MX and submission edges, an IMAP server, a SQLite reference backend, and a web console.
Deployment: The project says it runs on Node.js 22.5 or later and documents Docker Compose, VPS, Fly.io, and Railway deployments.
Headquarters: Sheridan, Wyoming, USA
IMAP: The IMAP4 server uses implicit TLS on port 993 and is described as read-mostly INBOX and Sent.
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.
Inbound delivery: Inbound messages can be delivered to the backend as signed webhooks with retries, or accessed through REST or IMAP.
Inbound mail: The MX edge checks recipients and sends raw messages to the backend as signed webhooks.
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.
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.

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