Haraka

Spec sheet

Purpose

Haraka is a high-performance, flexible SMTP server written in Node.js.Read 8 Oct 2026 · haraka.github.io

Integrations

Listed plugins support systems and services including LDAP, Dovecot, Redis, Kafka, MongoDB, SpamAssassin, and Rspamd.Read 8 Oct 2026 · haraka.github.io

Support

The project directs users to its mailing list and GitHub Issues for help.Read 8 Oct 2026 · haraka.github.io

License

Haraka is MIT licensed.Read 8 Oct 2026 · haraka.github.io

Authentication security

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

Mail filtering

Haraka can be used as a filtering MTA, with plugins for spam protection and checks such as DNS blocklists.Read 8 Oct 2026 · haraka.github.io

Not a mail store

Haraka says it is not a mail store, LDA, or IMAP server and is typically used alongside such systems.Read 8 Oct 2026 · haraka.github.io

Outbound delivery

Haraka includes an outbound mail delivery engine that queues messages marked for relaying.Read 8 Oct 2026 · haraka.github.io

Plugin architecture

Its modular plugin system lets JavaScript programmers change how the server behaves.Read 8 Oct 2026 · haraka.github.io

Project stewardship

The website says Haraka was started by Matt Sergeant and is maintained by the Haraka community.Read 8 Oct 2026 · haraka.github.io

Runtime requirement

Haraka requires Node.js and can be installed through npm, yarn, or pnpm.Read 8 Oct 2026 · haraka.github.io

Scale

The documentation says Haraka can serve thousands of concurrent connections and deliver thousands of messages per second.Read 8 Oct 2026 · haraka.github.io

Submission agent

Haraka can run as a message submission agent on port 587 with authentication and DKIM plugins enabled.Read 8 Oct 2026 · haraka.github.io

TLS

The TLS plugin enables STARTTLS and supports configurable certificates and TLS settings.Read 8 Oct 2026 · haraka.github.io

Plans and prices

Every Haraka plan and price →

Where Specifiction places it

• Mail Server Software#22 of 347.7