Haraka

What it does

Authentication security

The flat-file authentication plugin stores passwords in clear text, and its documentation recommends using auth-encfile to protect credentials.checked 8 Oct 2026

Integrations

Listed plugins support systems and services including LDAP, Dovecot, Redis, Kafka, MongoDB, SpamAssassin, and Rspamd.checked 8 Oct 2026

License

Haraka is MIT licensed.checked 8 Oct 2026

Mail filtering

Haraka can be used as a filtering MTA, with plugins for spam protection and checks such as DNS blocklists.checked 8 Oct 2026

Not a mail store

Haraka says it is not a mail store, LDA, or IMAP server and is typically used alongside such systems.checked 8 Oct 2026

Outbound delivery

Haraka includes an outbound mail delivery engine that queues messages marked for relaying.checked 8 Oct 2026

Plugin architecture

Its modular plugin system lets JavaScript programmers change how the server behaves.checked 8 Oct 2026

Project stewardship

The website says Haraka was started by Matt Sergeant and is maintained by the Haraka community.checked 8 Oct 2026

Purpose

Haraka is a high-performance, flexible SMTP server written in Node.js.checked 8 Oct 2026

Runtime requirement

Haraka requires Node.js and can be installed through npm, yarn, or pnpm.checked 8 Oct 2026

Scale

The documentation says Haraka can serve thousands of concurrent connections and deliver thousands of messages per second.checked 8 Oct 2026

Submission agent

Haraka can run as a message submission agent on port 587 with authentication and DKIM plugins enabled.checked 8 Oct 2026

Support

The project directs users to its mailing list and GitHub Issues for help.checked 8 Oct 2026

TLS

The TLS plugin enables STARTTLS and supports configurable certificates and TLS settings.checked 8 Oct 2026