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Comparison · Comms
Dovecot vs Proton Bridge
A side-by-side editorial comparison of Dovecot and Proton Bridge — release velocity, themes, recent moves, and the top alternatives to consider.
Shared themes:imap
Dovecot vs Proton Bridge: at a glance
What is Dovecot?
Dovecot's 2.4 rewrite is still being paid for — twelve CVEs across two releases, two of them 2.4 regressions.
Dovecot 2.4 broke configuration compatibility outright in January 2025 and the line has been stabilizing ever since. The last two releases are dominated by security work: 2.4.3 shipped eight CVEs including SQL and LDAP injection when auth_username_chars is empty — both labelled v2.4 regressions — and 2.4.4 added four more, among them a fakeable CRAM channel binding and an incomplete earlier fix. Alongside that, 2.4.4 permanently drops root privileges in indexer-worker, quota-status and script-login before they serve requests.
What is Proton Bridge?
Proton Bridge spends its first release in ten weeks on crashes, memory bounds and dead code
v3.26.0 is a maintenance cut. The user-visible items are a macOS 27 crash fix, bounded CPU and memory in the Gluon RFC parser, deletion of orphaned unencrypted vaults once keychain access returns, and a meta+W shortcut. The rest is internal: two unused subsystems removed from go-proton-api, two Go toolchain bumps, gomock swapped for uber-go/mock, and June and July vulnerability patches folded in.
Dovecot vs Proton Bridge: editorial side-by-side
Dovecot
0.0COMMS
Dovecot's 2.4 rewrite is still being paid for — twelve CVEs across two releases, two of them 2.4 regressions.
◆ Current state
Dovecot 2.4 broke configuration compatibility outright in January 2025 and the line has been stabilizing ever since. The last two releases are dominated by security work: 2.4.3 shipped eight CVEs including SQL and LDAP injection when auth_username_chars is empty — both labelled v2.4 regressions — and 2.4.4 added four more, among them a fakeable CRAM channel binding and an incomplete earlier fix. Alongside that, 2.4.4 permanently drops root privileges in indexer-worker, quota-status and script-login before they serve requests.
◆ Where it's heading
The 2.4 line is a rewrite absorbing its own cost. Dependencies are being replaced rather than pinned — libicu swapped for an in-house unicode library, libpcre2 brought in for regular expressions — and the process model is being tightened, with permanent privilege drops and a reworked service_reuse_port that pre-creates one socket per process. IMAP4rev2 and UTF-8 mail remain behind build flags and config toggles, so the modern-protocol work is real but deliberately unshipped.
◆ Prediction
Expect the CVE cadence to keep tracking the areas the rewrite touched — auth escaping, IMAP parsing limits and the variable expansion introduced in 2.4 — rather than long-settled code. The experimental IMAP4rev2 and mail_utf8 flags are the obvious candidates to graduate once the security churn slows, though nothing in these entries sets a date.
Proton Bridge
2.5COMMS
Proton Bridge spends its first release in ten weeks on crashes, memory bounds and dead code
◆ Current state
v3.26.0 is a maintenance cut. The user-visible items are a macOS 27 crash fix, bounded CPU and memory in the Gluon RFC parser, deletion of orphaned unencrypted vaults once keychain access returns, and a meta+W shortcut. The rest is internal: two unused subsystems removed from go-proton-api, two Go toolchain bumps, gomock swapped for uber-go/mock, and June and July vulnerability patches folded in.
◆ Where it's heading
Releases arrive in long gaps — ten weeks since v3.25.0 — and each one bundles a quarter of dependency hygiene with a handful of IMAP correctness fixes. The recurring theme is RFC 3501 conformance and resource bounds in the mail parser rather than new capability, which is what a local IMAP shim for an encrypted mailbox is supposed to look like.
◆ Prediction
Given the pattern of shipping OS-compatibility fixes shortly after a macOS release, the next cut is likely another maintenance bundle timed to whatever the current macOS version breaks.
Alternatives to Dovecot and Proton Bridge
Other Comms products tracked by Sparkpulse, ranked by recent ship velocity. Each card links to a full editorial trajectory and lets you pivot into a head-to-head comparison with either Dovecot or Proton Bridge.
Stalwart
Stalwart is chasing mail RFCs and its own storage layer at the same time
Mux
Every manual control Mux ships now arrives with a Robots workflow that does it for you
Netcore Cloud
Netcore's feed remains a demand-generation channel; ten entries, zero product releases.
mailcow
mailcow's release notes are almost entirely upstream security currency.
Openfire
Openfire keeps its XMPP server current without changing what it is.
See all Dovecot alternatives → · See all Proton Bridge alternatives →
Recent activity from Dovecot and Proton Bridge
Latest ship moves from both products, interleaved chronologically. ⚡ = editorial spark.
- 1d agoProton BridgeBridge 3.26.0: macOS 27 crash fix and bounded RFC parser resources
- 2mo agoProton BridgeBridge 3.25.0: IMAP and sync fixes bundled with dependency updates
- 3mo agoDovecotFour more CVEs, and root is dropped permanently
- 3mo agoProton BridgeBridge 3.24.2 patch with a single-line note
- 4mo agoProton BridgeBridge 3.24.1 patch with a single-line note
- 4mo agoDovecotEight CVEs, two of them 2.4 regressions
- 4mo agoProton BridgeBridge 3.24.0 Nescio feature cut
- 4mo agoProton BridgeBridge 3.23.1 patch on the Margit line
- 9mo agoDovecotlibicu replaced in-house; IMAP4rev2 lands experimental
- 1y agoDovecotFirst 2.4 patch, carrying the new signing key
- 1y agoDovecotDovecot v2.4.0 ⚡
- 2y agoDovecotHeader limits imposed after CPU exhaustion CVEs
Frequently asked questions
What is the difference between Dovecot and Proton Bridge?
Both compete on the same themes — imap — within Comms. Proton Bridge is currently shipping more aggressively (velocity 2.5 vs 0.0), with 0 editorial sparks in the last 30 days against 0. See the at-a-glance table above for a side-by-side breakdown of velocity, recent sparks, and editorial themes.
Is Dovecot better than Proton Bridge?
Sparkpulse doesn't pick a winner — we score release velocity, not feature parity. Proton Bridge is currently shipping more aggressively (velocity 2.5 vs 0.0), with 0 editorial sparks in the last 30 days against 0. For your specific use case, the alternatives sections above list other Comms products to evaluate alongside.
What are the best alternatives to Dovecot?
Top Dovecot alternatives in Comms are ranked by recent ship velocity. Browse the "Dovecot alternatives" section above for the current picks, or visit /alternatives/dovecot for the full list with editorial commentary on each.
What are the best alternatives to Proton Bridge?
Top Proton Bridge alternatives in Comms are ranked by recent ship velocity. Browse the "Proton Bridge alternatives" section above for the current picks, or visit /alternatives/proton-bridge for the full list with editorial commentary on each.