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Proton Bridge

COMMS
Velocity5.0

Encrypted email bridge connecting Proton Mail to desktop email clients

proton.me/mail/bridge ↗

Proton Bridge stays in maintenance mode: sync-state recovery, security patches, IMAP correctness.

emailimapsecurity-patchessync-reliabilitymaintenance
◆Current state
Proton Bridge's releases in 2026 have been almost entirely maintenance: monthly vulnerability patches, Go toolchain bumps, IMAP RFC-compliance fixes, and now recovery from corrupted sync state files. User-facing additions are small (a close-window shortcut, CLI version display).
◆Where it's heading
The product is mature infrastructure focused on reliability rather than capability. The steady attention to sync robustness and error mapping suggests the team is working down support load, not building new surface.
◆Prediction
Expect more point releases for security patches and sync fixes. The entries show no sign of a larger feature push.

◆Recent moves

  1. 1mo ago

    v3.27.1: recover from corrupted sync state

    v3.27.1 recovers from a corrupted sync state file and forces a file sync during writes. It's a narrow reliability fix in line with the maintenance-only pattern.

    View source ↗
  2. 1mo ago

    v3.27.0: August security patches and IMAP fixes

    v3.27.0 patches August 2026 vulnerabilities, caps MIME structure depth, and fixes RFC3501 compliance for IMAP responses. It's steady hardening with no new user capability.

    View source ↗
  3. 2mo ago

    v3.26.0: July security patches and cleanup

    v3.26.0 patches July vulnerabilities, adds a close-window shortcut, and removes unused go-proton-api code. The shortcut is the only visible change in a mostly internal release.

    View source ↗
  4. 5mo ago

    v3.25.0: clearer errors, legacy updater removed

    v3.25.0 maps more API errors to readable messages, bumps the Go toolchain, and removes legacy updater logic. It lowers support friction without changing features.

    View source ↗
  5. 6mo ago

    v3.24.2: new Go base image

    v3.24.2 moves to a Debian Bullseye-based Go image. It's a build change only.

    View source ↗
  6. 6mo ago

    v3.24.1: restore old unlabel logic behind flag

    v3.24.1 restores the old unlabel endpoint logic behind a feature flag, rolling back a behavior change from the previous release.

    View source ↗