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Comparison · Comms
Telnyx vs Mailu
A side-by-side editorial comparison of Telnyx and Mailu — release velocity, themes, recent moves, and the top alternatives to consider.
Telnyx vs Mailu: at a glance
What is Telnyx?
Telnyx is bolting every communication channel and every model onto one bill.
Telnyx runs voice, SMS, and WhatsApp on its own network and has spent this window adding two things: email as a fourth channel, and more model choice inside Voice AI. The Email API entered beta, while Kimi K3 joined Telnyx Inference and GPT-5.4-mini, NVIDIA Parakeet STT, and Fish Audio TTS joined the voice agent stack. Voicemail greetings became configurable per number.
What is Mailu?
A mail server whose entire visible output is patching other people's code.
Mailu is a self-hosted mail suite shipped as a Docker compose stack, and the 2024.06.x branch shown here is its maintenance line. Every release in the window is a single-issue patch — a Roundcube bump, a CVE fix, an autoconfig tweak. The cadence looks high at ten pinned releases in five months, but each carries one change.
Telnyx vs Mailu: editorial side-by-side
Telnyx
7.5COMMS
Telnyx is bolting every communication channel and every model onto one bill.
◆ Current state
Telnyx runs voice, SMS, and WhatsApp on its own network and has spent this window adding two things: email as a fourth channel, and more model choice inside Voice AI. The Email API entered beta, while Kimi K3 joined Telnyx Inference and GPT-5.4-mini, NVIDIA Parakeet STT, and Fish Audio TTS joined the voice agent stack. Voicemail greetings became configurable per number.
◆ Where it's heading
Two threads run in parallel. The channel thread is consolidation — one API and one bill across voice, messaging, and now email — which competes on procurement rather than features. The model thread is optionality: Telnyx is positioning as the place where you pick the STT, LLM, and TTS for a voice agent rather than accepting a vendor's fixed pipeline, with self-hosted options like Parakeet keeping traffic on its own network.
◆ Prediction
Email should reach general availability with deliverability tooling attached, since a beta send API without reputation management is not sellable against Postmark or Resend. Expect model additions to continue at roughly this cadence; they are routine here, not directional.
Mailu
5.0COMMS
A mail server whose entire visible output is patching other people's code.
◆ Current state
Mailu is a self-hosted mail suite shipped as a Docker compose stack, and the 2024.06.x branch shown here is its maintenance line. Every release in the window is a single-issue patch — a Roundcube bump, a CVE fix, an autoconfig tweak. The cadence looks high at ten pinned releases in five months, but each carries one change.
◆ Where it's heading
Most of what Mailu ships is downstream maintenance of its bundled components, Roundcube above all, which drove three of these ten releases. The project's own work here is defensive: escaping user-controlled fields in generated sieve scripts, setting X-Forwarded-By, adapting to Microsoft's new autodiscover. This is a product in steady-state operation, where the release notes track what upstream broke rather than what Mailu decided to build.
◆ Prediction
The next pinned release will most likely be another Roundcube or Alpine bump, since component upgrades triggered half the releases here. These entries say nothing about what is happening on the main branch.
Alternatives to Telnyx 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 Telnyx or Mailu.
Chatwoot
Chatwoot added voice, then pointed its AI agent at the tickets it already resolved.
Roundcube
After four years, Roundcube 1.7 lands — and the release stream is otherwise all CVEs
Signal Desktop
Signal's beta train is quietly handing group admins real moderation powers.
Notion
Notion is turning itself into the place other companies' agents come to work.
Slack
Slack's app platform is being rebuilt around agents, with the SDKs clearing old ground behind it.
See all Telnyx alternatives → · See all Mailu alternatives →
Recent activity from Telnyx and Mailu
Latest ship moves from both products, interleaved chronologically. ⚡ = editorial spark.
- 2d agoTelnyxEmail API Now Available in Beta ⚡
- 3d agoTelnyxKimi K3 Now Available on Telnyx Inference
- 5d agoMailuAutoconfig fix for modern K-9 Mail
- 7d agoMailuRoundcube 1.6.17 closes two CVEs
- 8d agoTelnyxGPT-5.4-mini Now Available for Telnyx Voice AI Assistants
- 11d agoTelnyxCustom Voicemail Greetings Now Available for Telnyx Phone Numbers
- 12d agoMailuSets X-Forwarded-By in response to a GHSA advisory
- 14d agoTelnyxNVIDIA Parakeet STT Now Available for Telnyx Voice AI
- 18d agoTelnyxFish Audio TTS Now Available for Telnyx Voice AI
- 26d agoMailuAdmin UI keeps form values on failed submit
- 1mo agoMailuEscapes sieve fields, fixing autoreplies with special characters
- 2mo agoMailuRoundcube 1.6.16 and carddav 5.1.3 close CVE-2026-49217
Frequently asked questions
What is the difference between Telnyx and Mailu?
They serve adjacent needs but don't currently overlap on shipped themes. Telnyx is currently shipping more aggressively (velocity 7.5 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 Telnyx better than Mailu?
Sparkpulse doesn't pick a winner — we score release velocity, not feature parity. Telnyx is currently shipping more aggressively (velocity 7.5 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 Telnyx?
Top Telnyx alternatives in Comms are ranked by recent ship velocity. Browse the "Telnyx alternatives" section above for the current picks, or visit /alternatives/telnyx 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.