# rspamd/rspamd

Rapid spam filtering system.

Repository: https://github.com/rspamd/rspamd
Canonical: https://ross.abutalabs.com/products/rspamd
Language: C
License: NOASSERTION
License Family: other
Topics: c, rspamd, lua, spam-filter, email
Last push: 2026-08-26T16:27:40+00:00

## Health v2 (maintenance only)
Score: 99/100 (v2, computed 2026-09-02T17:46:02.011165+00:00)
- activity 99, release rhythm 98, longevity 100
- inputs: {"age_days": 4884, "days_push": 7, "days_rel": 18, "gap_med": 17, "n_releases_24m": 20}
- flags: no_license
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 2514, forks 483 (observed 2026-08-28T04:06:57.561771+00:00)

## What it is
Rspamd is an advanced spam filtering system and email processing framework written in C with an extensive Lua plugin API. It evaluates messages using rules, statistical analysis, and external services, and can act as a Milter to integrate directly with MTAs like Postfix and Sendmail.

## Use cases
- filter spam from incoming email on my mail server
- integrate spam checking with postfix via milter
- score emails with bayesian statistics and url blacklists
- add dkim signing and verification to email processing
- write custom email filtering rules in lua
- process hundreds of emails per second with low latency

## When to choose
- you run your own mail server and need high-performance, extensible spam filtering
- you want milter-based integration with Postfix, Sendmail, or other MTAs
- you need customizable filtering rules via a Lua plugin API

## When to avoid
- you need a simple hosted spam solution without self-hosting infrastructure
- you only need basic client-side spam handling in a mail client

## Facets
- artifact type: service
- maturity: active
- function: security, email, middleware, plugin-system
- domain: email, security, self-hosted
- platform: bsd, cross-platform, self-hosted
- tags: spam-filter, milter, email-processing, lua-plugins, dkim, mta-integration, messaging, linux

## Member repositories
- rspamd/rspamd (main) score 99

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:06:57.561771+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T02:26:14.083616+00:00, confidence not recorded.
  - readme: https://github.com/rspamd/rspamd (fetched 2026-08-28T04:06:57.561771+00:00, sha 711e380b6bbb)
- Data as of 2026-08-30T08:39:29.467469+00:00.