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MailKite Server

Free#22 of 32 in Email APIs

MailKite Server: A self-hosted email stack for inbound mail, APIs, webhooks, and SMTP relay delivery. Ranked #22 of 32 in Email APIs by our editors (6.6/10); pricing: Free plan; best for self-hosters needing inbound mail infrastructure.

6.6/10Editor score
Visit MailKite
MailKite Server6.6 Visit MailKite

At a glance

  • Editor score
    6.6 / 10
  • Pricing
    Free plan
  • Best for
    Self-hosters needing inbound mail infrastructure
  • Free plan
    Yes
  • Paid from
    Free
  • Inbound email
    Yes
  • Facts checked
    23 Sep 2026
MailKite Server screenshot

  • Where it wins

    • Inbound SMTP, IMAP4, REST access, and signed webhook delivery
    • Self-hosted open-source stack with Docker, systemd, Fly.io, and Railway
    • Web console covers domains, DNS records, routes, messages, and credentials

  • Where it doesn't

    • Outbound delivery depends on an SMTP smarthost or relay
    • Self-hosting requires responsibility for deployment and operations
    • Rule-based routing may be less flexible than custom application workflows

Our verdict on MailKite Server

MailKite Server is an AGPL-3.0, self-hosted email server for applications and AI agents. It combines a Haraka-based SMTP MX edge, authenticated SMTP submission, an IMAP4 server, a REST API, signed inbound webhooks, outbound smarthost delivery, and a web console. The product fits developers and infrastructure teams that need inbound email handling under their control rather than a hosted-only service.

Its strongest area is infrastructure breadth. Inbound SMTP includes anti-open-relay recipient checks, while authenticated submission supports ports 587 and 465. IMAP4 is available with implicit TLS on port 993, and the REST API supports sending and message access. Signed inbound webhooks include retries, giving applications an event-driven path for processing messages. Rule-based routes cover webhooks, forwarding, and AI-agent handling. Together, these components make MailKite Server more than an SMTP endpoint: it provides several ways to receive, inspect, route, and act on email.

Deployment flexibility is another practical advantage. The stack runs on Node.js hosts and supports Docker, systemd, Fly.io, and Railway. A SQLite reference backend has zero npm dependencies, and the web console manages domains, DNS records, messages, routes, webhooks, and credentials. Outbound mail still goes through an SMTP relay, so teams seeking direct delivery infrastructure may need a different architecture. Those wanting hosted backend and deliverability services should look to MailKite Cloud instead. MailKite Server is the better fit for teams comfortable operating their own mail layer and wanting open-source control over inbound workflows.

Your product? Our editors can test MailKite Server in depth and publish a review, labelled as paid · from $149/mo →

MailKite Server pricing

Plans Free planFree Free to use — no paid tier required for the core job.
See plans on mailkite.dev

MailKite Server fact sheet

Free planYes
Paid fromFree
Monthly send limitNot verified
Inbound emailYes
Delivery event webhooksYes
SMTP relayYes
Email templatesNot verified
Dedicated IP optionNot verified
DeploymentSelf-hosted
PlatformsWeb
Built forSolo, Small business, Mid-market (editorial estimate)
PricingFree plan
Websitemailkite.dev
Facts checked23 Sep 2026

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Featured on iTechGuides

Featured on iTechGuides — MailKite Server 6.6/10

MailKite Server is listed in our Email APIs directory. Add the badge to your site — it links back to this page.

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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

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