# ProtonMail/proton-bridge

Proton Mail Bridge application

Repository: https://github.com/ProtonMail/proton-bridge
Canonical: https://ross.abutalabs.com/products/proton-bridge
Language: Go
License: GPL-3.0
License Family: copyleft
Last push: 2026-08-17T12:47:35+00:00

## Health v2 (maintenance only)
Score: 94/100 (v2, computed 2026-09-02T17:46:02.011165+00:00)
- activity 98, release rhythm 86, longevity 100
- inputs: {"age_days": 2339, "days_push": 16, "days_rel": 16, "gap_med": 32.5, "n_releases_24m": 17}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1536, forks 230 (observed 2026-08-28T04:05:00.014077+00:00)

## What it is
Proton Mail Bridge is a desktop application that runs local IMAP and SMTP servers, allowing standard email clients to send and receive encrypted Proton Mail. It handles authentication, local keychain storage, and secure automatic updates via a signed launcher.

## Use cases
- use Thunderbird or Outlook with my Proton Mail account
- set up IMAP and SMTP access for Proton Mail
- sync a desktop email client with encrypted Proton Mail
- run a local mail proxy for Proton Mail
- send Proton Mail through my existing email app
- configure email client settings for Proton Mail

## When to choose
- you use Proton Mail and want a traditional desktop email client
- you need IMAP/SMTP compatibility with end-to-end encrypted mail
- you want automatic updates and signature verification for a mail bridge

## When to avoid
- you only use Proton Mail in the browser or mobile apps
- you need a headless mail relay without a GUI
- your Linux system lacks a supported keychain like gnome-keyring or pass

## Facets
- artifact type: application
- maturity: active
- function: email, http-server, security, cryptography
- domain: email, privacy, security, desktop-applications
- platform: windows, go
- tags: imap, smtp, proton-mail, email-client-integration, encryption, local-server, macos, linux, desktop

## Member repositories
- ProtonMail/proton-bridge (main) score 94

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:05:00.014077+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 2026-08-30T04:31:03.387618+00:00, confidence not recorded.
  - readme: https://github.com/ProtonMail/proton-bridge (fetched 2026-08-28T04:05:00.014077+00:00, sha 4c98fe5ddd72)
- Data as of 2026-08-30T08:39:29.467469+00:00.