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Comparison · Comms
Bandwidth vs Mailu
A side-by-side editorial comparison of Bandwidth and Mailu — release velocity, themes, recent moves, and the top alternatives to consider.
Bandwidth vs Mailu: at a glance
What is Bandwidth?
Bandwidth adds branded calling — the first move beyond closing self-service gaps.
Most of Bandwidth's recent changelog reads as friction removal: Voice API debug logs surfaced in Voice Insights so customers stop opening tickets, self-service FOC date changes on port-in orders, MOS scores in the app, a longer delivery-receipt window. Identity Presentation breaks that pattern — it is a new product surface rather than a gap closed, putting brand name, logo and call reason on the recipient's handset with a pre-call authentication API to stop the display being spoofed.
What is Mailu?
Mailu ships one pinned release per issue, and most of them are Roundcube's.
The 2024.06 branch releases on demand: an issue or PR comes in, a pinned version goes out, and the changelog is one or two lines. Four of the six most recent releases are webmail-driven — three Roundcube bumps in this window alone, the latest to 1.6.18 clearing a TLS-configuration warning, an earlier one to 1.6.17 closing two CVEs. The remainder are Mailu's own code: an X-Forwarded-By header fix tied to a published advisory, sieve field escaping that repaired autoreplies and closed an injection path, and two admin-UI form flow corrections.
Bandwidth vs Mailu: editorial side-by-side
Bandwidth
6.3COMMS
Bandwidth adds branded calling — the first move beyond closing self-service gaps.
◆ Current state
Most of Bandwidth's recent changelog reads as friction removal: Voice API debug logs surfaced in Voice Insights so customers stop opening tickets, self-service FOC date changes on port-in orders, MOS scores in the app, a longer delivery-receipt window. Identity Presentation breaks that pattern — it is a new product surface rather than a gap closed, putting brand name, logo and call reason on the recipient's handset with a pre-call authentication API to stop the display being spoofed.
◆ Where it's heading
Two tracks. Coverage keeps expanding country by country toward full PSTN replacement — Brazil, Mexico and South Korea landed together — which is the wholesale carrier business growing its footprint. The newer track is moving up the stack into call identity and trust, where the product is not minutes but whether the call gets answered. Identity Presentation arriving as a beta built on third-party providers suggests Bandwidth is assembling that layer rather than building it outright.
◆ Prediction
Expect Identity Presentation to move from beta to general availability with a defined pricing model, and the Identity Authentication API to be positioned alongside it as the anti-spoofing control. Country coverage announcements should continue on their steady cadence.
Mailu
5.0COMMS
Mailu ships one pinned release per issue, and most of them are Roundcube's.
◆ Current state
The 2024.06 branch releases on demand: an issue or PR comes in, a pinned version goes out, and the changelog is one or two lines. Four of the six most recent releases are webmail-driven — three Roundcube bumps in this window alone, the latest to 1.6.18 clearing a TLS-configuration warning, an earlier one to 1.6.17 closing two CVEs. The remainder are Mailu's own code: an X-Forwarded-By header fix tied to a published advisory, sieve field escaping that repaired autoreplies and closed an injection path, and two admin-UI form flow corrections.
◆ Where it's heading
This is a maintenance branch behaving exactly as a maintenance branch should, and the pinned-version model is the product: operators get upstream security work packaged and tagged without tracking Roundcube themselves. The security items divide cleanly — most arrive from bundled components, a minority from Mailu's own code, and the project patches both on the same cadence. Nothing in this window suggests new capability is being developed on this branch.
◆ Prediction
Expect the next release to follow the same trigger: a Roundcube advisory or a client compatibility report producing a single-line changelog and a new pinned tag. Any feature work would be happening on the main version, which this feed does not cover.
Alternatives to Bandwidth and Mailu
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 Bandwidth or Mailu.
Proton Bridge
Proton Bridge spends its first release in ten weeks on crashes, memory bounds and dead code
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.
See all Bandwidth alternatives → · See all Mailu alternatives →
Recent activity from Bandwidth and Mailu
Latest ship moves from both products, interleaved chronologically. ⚡ = editorial spark.
- 5d agoBandwidthIdentity Presentation – Beta ⚡
- 6d agoMailuRoundcube 1.6.18 bump clears a TLS-config warning
- 9d agoBandwidthVoice API debug logs — now available in Voice Insights
- 13d agoBandwidthSelf-Service of Short-Notice FOC Changes and Cancellations
- 21d agoBandwidthVoice Quality Metrics: MOS Scores
- 23d agoMailuAutoconfig fix for modern K-9 Mail
- 25d agoMailuRoundcube 1.6.17 closes two CVEs
- 1mo agoMailuSets X-Forwarded-By in response to a GHSA advisory
- 1mo agoBandwidthMessaging Delivery Enhancements
- 1mo agoMailuAdmin UI keeps form values on failed submit
- 1mo agoBandwidth10DLC Registration Center – API Access
- 1mo agoMailuEscapes sieve fields, fixing autoreplies with special characters
Frequently asked questions
What is the difference between Bandwidth and Mailu?
They serve adjacent needs but don't currently overlap on shipped themes. Bandwidth is currently shipping more aggressively (velocity 6.3 vs 5.0), with 1 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 Bandwidth better than Mailu?
Sparkpulse doesn't pick a winner — we score release velocity, not feature parity. Bandwidth is currently shipping more aggressively (velocity 6.3 vs 5.0), with 1 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 Bandwidth?
Top Bandwidth alternatives in Comms are ranked by recent ship velocity. Browse the "Bandwidth alternatives" section above for the current picks, or visit /alternatives/bandwidth for the full list with editorial commentary on each.
What are the best alternatives to Mailu?
Top Mailu alternatives in Comms are ranked by recent ship velocity. Browse the "Mailu alternatives" section above for the current picks, or visit /alternatives/mailu for the full list with editorial commentary on each.