# flashmob/go-guerrilla

Mini SMTP server written in golang

Repository: https://github.com/flashmob/go-guerrilla
Canonical: https://ross.abutalabs.com/products/go-guerrilla
Language: Go
License: MIT
License Family: permissive
Topics: go, smtp-server, server, smtp, mda, mail-delivery-agent
Last push: 2024-06-04T11:33:17+00:00

## Health v2 (maintenance only)
Score: 23/100 (v2, computed 2026-09-02T17:46:02.011165+00:00)
- activity 0, release rhythm 8, longevity 100
- inputs: {"age_days": 5041, "days_push": 820, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 2958, forks 376 (observed 2026-08-28T04:07:32.256110+00:00)

## What it is
Go-Guerrilla is a lightweight SMTP server daemon written in Go, designed for receiving large volumes of email quickly and efficiently. It can be used as a standalone daemon or embedded as a package, with a modular processor backend for custom mail handling.

## Use cases
- run a lightweight smtp server to receive email
- accept inbound mail without full mta sending features
- build a disposable email service like guerrillamail
- store incoming email in mysql or redis
- chain custom processors to validate recipients and save mail
- receive large volumes of email on a multi-core server

## When to choose
- you only need to receive email, not send it
- you want a memory-safe, high-performance smtp daemon in go
- you need a modular, extensible mail processing pipeline
- you want config hot-reloading and multiple smtp servers sharing one backend

## When to avoid
- you need a full mta with sending and relaying capabilities
- you want a turnkey mail server with imap/pop3 and webmail
- you need actively maintained software with guaranteed upstream support

## Facets
- artifact type: service
- maturity: maintenance
- function: http-server, email, middleware
- domain: email, backend, self-hosted
- platform: go, cross-platform, self-hosted
- tags: smtp-server, mail-delivery-agent, mta, mail-receiving, daemon, messaging, linux

## Member repositories
- flashmob/go-guerrilla (main) score 23

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:07:32.256110+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 2026-08-30T07:32:11.569637+00:00, confidence not recorded.
  - readme: https://github.com/flashmob/go-guerrilla (fetched 2026-08-28T04:07:32.256110+00:00, sha 021e12fad43e)
- Data as of 2026-08-30T08:39:29.467469+00:00.