SHSelfHostIndex
MA

MailWhale

Self-hosted transactional email relay with API

Mail Servers Archived ★ 372 stars Easy setup MIT

This project is archived. Upstream development has stopped, so expect no new features or security fixes. Consider an actively maintained mail servers alternative.

MailWhale is a self-hosted SMTP relay that gives applications a simple way to send transactional email, with an HTTP API, multiple sender identities, and per-application access control.

Official siteSource code

Key features

  • Self-hosted transactional email relay
  • HTTP API for sending mail
  • Per-application access control

Strengths

  • Released under the MIT license
  • Easy to set up — beginner-friendly
  • First-class Docker support for quick deployment
  • Written in Go

Is MailWhale secure?

OSV.dev has no published security advisories for MailWhale's repository. No known vulnerabilities is not proof of security: it means none have been publicly catalogued.

Source: OSV.dev, checked 2026-10-14. How this is measured.

MailWhale replaces

Self-hosted SendGrid alternativesSelf-hosted Postmark alternatives

Health badge

Maintain MailWhale? Add its health score to your README. The badge links back to this page.

SelfHostIndex: 9 · archived

Markdown
[![SelfHostIndex health score for MailWhale](https://selfhostindex.com/badge/mailwhale.svg)](https://selfhostindex.com/app/mailwhale/)
HTML
<a href="https://selfhostindex.com/app/mailwhale/"><img src="https://selfhostindex.com/badge/mailwhale.svg" alt="SelfHostIndex health score for MailWhale"></a>
reStructuredText
.. image:: https://selfhostindex.com/badge/mailwhale.svg
   :alt: SelfHostIndex health score for MailWhale
   :target: https://selfhostindex.com/app/mailwhale/

The score is recomputed on every nightly rebuild from public repository data — see how it is calculated.

Compare MailWhale

3 head-to-head comparisons.

Similar mail servers apps