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Telnyx is bolting every communication channel and every model onto one bill.
Alternatives · team communication tools
Mailu alternatives
The best Mailu alternatives in team communication tools, ranked by Sparkpulse's velocity_score.
Updated Jul 31, 2026
Looking for the best alternatives to Mailu? Sparkpulse tracks and ranks 12 alternatives in team communication tools by shipping velocity — how frequently each ships meaningful updates, verified from official changelogs. For reference, Mailu shipped 0 meaningful updates in the last 30 days and carries a velocity score of 5.0 out of 10 in 2026. The alternatives below are ranked the same way, so you're comparing real release momentum, not marketing claims.
About 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.
Velocity 5.0 · Last update 1h ago
Top 12 alternatives to Mailu
Ranked by recent ship velocity. Tap any card for the full editorial breakdown, or pivot to a head-to-head.
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Rocket.Chat is building for the air-gapped enterprise, and adding an AI layer on the way
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Slack's app platform is being rebuilt around agents, with the SDKs clearing old ground behind it.
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Twilio's changelog is mostly errata right now — corrections, error codes and deadlines
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Subsplash is turning its church dashboard from a record of activity into something that acts.
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Salesmsg is turning a texting inbox into an AI agent that also answers the phone.
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After four years, Roundcube 1.7 lands — and the release stream is otherwise all CVEs
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Signal's beta train is quietly handing group admins real moderation powers.
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Notion is turning itself into the place other companies' agents come to work.
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The reference Matrix homeserver shipping protocol work on a tight release train
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Netcore is selling marketing agents and privacy-safe personalization, mostly through blog posts.
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Krisp turned noise cancellation into a contact-center AI stack — and now defends it against deepfakes.
Mailu vs alternatives — shipping velocity at a glance
Velocity score (0–10) and meaningful releases shipped in the last 30 days, from official changelogs. Higher = shipping faster.
| Product | Velocity | Sparks · 30d | Focus areas | Latest release |
|---|---|---|---|---|
| Mailu (baseline) | 5.0 | 0 | self-hosted-emaildockersecurity-patches | — |
| Telnyx | 7.5 | 1 | email-apivoice-aimodel-choice | Email API Now Available in Beta |
| Rocket.Chat | 6.3 | 1 | air-gappedfips-complianceai-search | 8.7 adds AI Search, FIPS mode and phishing-resistant OAuth |
| Slack | 6.3 | 1 | agentsdeveloper-platformblock-kit | Agent context has landed |
| Twilio | 6.3 | 0 | cpaasmessagingevent-streams | — |
| Subsplash | 6.3 | 1 | church-managementworkflow-automationnatural-language-query | Email Automations for Workflows |
| Salesmsg | 6.3 | 1 | ai-agentssms-messagingvoice-ivr | Collect More Reviews and Turn Every Rating Into an Opportunity |
| Roundcube | 5.0 | 0 | webmailphpsecurity | Roundcube Webmail 1.7.0 |
| Signal Desktop | 5.0 | 0 | group-admindisappearing-messagesbeta-train | — |
| Notion | 5.0 | 0 | agentsorchestrationdeveloper-platform | Notion 3.6: External Agents, HTML blocks, and more |
| Synapse | 5.0 | 0 | matrixfederationopen-source | — |
| Netcore Cloud | 5.0 | 0 | marketing-blog-feedagentic-marketingpii-tokenization | — |
| Krisp | 5.0 | 0 | contact-center-aivoice-securitydeepfake-detection | Krisp Voice Security reaches admins: defense against voice fraud |
The 12 best Mailu alternatives, in depth
1. Telnyx · velocity 7.5
Telnyx is bolting every communication channel and every model onto one bill.
Over the last 30 days Telnyx shipped 1 meaningful update vs Mailu's 0, most recently “Email API Now Available in Beta”. Its velocity score of 7.5/10 blends that with longer-term release cadence.
Where Mailu leans on self hosted email, docker and security patches, Telnyx focuses on email api, voice ai and model choice.
Over the last 30 days Telnyx has been shipping faster than Mailu — a point in its favour if release momentum matters to you.
2. Rocket.Chat · velocity 6.3
Rocket.Chat is building for the air-gapped enterprise, and adding an AI layer on the way.
Over the last 30 days Rocket.Chat shipped 1 meaningful update vs Mailu's 0, most recently “8.7 adds AI Search, FIPS mode and phishing-resistant OAuth”. Its velocity score of 6.3/10 blends that with longer-term release cadence.
Where Mailu leans on self hosted email, docker and security patches, Rocket.Chat focuses on air gapped, fips compliance and ai search.
Over the last 30 days Rocket.Chat has been shipping faster than Mailu — a point in its favour if release momentum matters to you.
Full Rocket.Chat trajectory → · Compare Mailu vs Rocket.Chat →
3. Slack · velocity 6.3
Slack's app platform is being rebuilt around agents, with the SDKs clearing old ground behind it.
Over the last 30 days Slack shipped 1 meaningful update vs Mailu's 0, most recently “Agent context has landed”. Its velocity score of 6.3/10 blends that with longer-term release cadence.
Where Mailu leans on self hosted email, docker and security patches, Slack focuses on agents, developer platform and block kit.
Over the last 30 days Slack has been shipping faster than Mailu — a point in its favour if release momentum matters to you.
4. Twilio · velocity 6.3
Twilio's changelog is mostly errata right now — corrections, error codes and deadlines.
Its velocity score of 6.3/10 reflects longer-term release cadence.
Where Mailu leans on self hosted email, docker and security patches, Twilio focuses on cpaas, messaging and event streams.
Twilio and Mailu have shipped at a similar pace over the last 30 days, so the decision comes down to fit and feature depth.
5. Subsplash · velocity 6.3
Subsplash is turning its church dashboard from a record of activity into something that acts.
Over the last 30 days Subsplash shipped 1 meaningful update vs Mailu's 0, most recently “Email Automations for Workflows”. Its velocity score of 6.3/10 blends that with longer-term release cadence.
Where Mailu leans on self hosted email, docker and security patches, Subsplash focuses on church management, workflow automation and natural language query.
Over the last 30 days Subsplash has been shipping faster than Mailu — a point in its favour if release momentum matters to you.
6. Salesmsg · velocity 6.3
Salesmsg is turning a texting inbox into an AI agent that also answers the phone.
Over the last 30 days Salesmsg shipped 1 meaningful update vs Mailu's 0, most recently “Collect More Reviews and Turn Every Rating Into an Opportunity”. Its velocity score of 6.3/10 blends that with longer-term release cadence.
Where Mailu leans on self hosted email, docker and security patches, Salesmsg focuses on ai agents, sms messaging and voice ivr.
Over the last 30 days Salesmsg has been shipping faster than Mailu — a point in its favour if release momentum matters to you.
7. Roundcube · velocity 5.0
After four years, Roundcube 1.7 lands — and the release stream is otherwise all CVEs.
Its velocity score of 5.0/10 reflects longer-term release cadence; its most recent meaningful update was “Roundcube Webmail 1.7.0”.
Where Mailu leans on self hosted email, docker and security patches, Roundcube focuses on webmail, php and security.
Roundcube and Mailu have shipped at a similar pace over the last 30 days, so the decision comes down to fit and feature depth.
8. Signal Desktop · velocity 5.0
Signal's beta train is quietly handing group admins real moderation powers.
Its velocity score of 5.0/10 reflects longer-term release cadence.
Where Mailu leans on self hosted email, docker and security patches, Signal Desktop focuses on group admin, disappearing messages and beta train.
Signal Desktop and Mailu have shipped at a similar pace over the last 30 days, so the decision comes down to fit and feature depth.
Full Signal Desktop trajectory → · Compare Mailu vs Signal Desktop →
9. Notion · velocity 5.0
Notion is turning itself into the place other companies' agents come to work.
Its velocity score of 5.0/10 reflects longer-term release cadence; its most recent meaningful update was “Notion 3.6: External Agents, HTML blocks, and more”.
Where Mailu leans on self hosted email, docker and security patches, Notion focuses on agents, orchestration and developer platform.
Notion and Mailu have shipped at a similar pace over the last 30 days, so the decision comes down to fit and feature depth.
10. Synapse · velocity 5.0
The reference Matrix homeserver shipping protocol work on a tight release train.
Its velocity score of 5.0/10 reflects longer-term release cadence.
Where Mailu leans on self hosted email, docker and security patches, Synapse focuses on matrix, federation and open source.
Synapse and Mailu have shipped at a similar pace over the last 30 days, so the decision comes down to fit and feature depth.
11. Netcore Cloud · velocity 5.0
Netcore is selling marketing agents and privacy-safe personalization, mostly through blog posts.
Its velocity score of 5.0/10 reflects longer-term release cadence.
Where Mailu leans on self hosted email, docker and security patches, Netcore Cloud focuses on marketing blog feed, agentic marketing and pii tokenization.
Netcore Cloud and Mailu have shipped at a similar pace over the last 30 days, so the decision comes down to fit and feature depth.
Full Netcore Cloud trajectory → · Compare Mailu vs Netcore Cloud →
12. Krisp · velocity 5.0
Krisp turned noise cancellation into a contact-center AI stack — and now defends it against deepfakes.
Its velocity score of 5.0/10 reflects longer-term release cadence; its most recent meaningful update was “Krisp Voice Security reaches admins: defense against voice fraud”.
Where Mailu leans on self hosted email, docker and security patches, Krisp focuses on contact center ai, voice security and deepfake detection.
Krisp and Mailu have shipped at a similar pace over the last 30 days, so the decision comes down to fit and feature depth.
Frequently asked questions
What are the best alternatives to Mailu?
The top Mailu alternatives we currently track in team communication tools are Telnyx, Rocket.Chat, Slack, Twilio, Subsplash, ranked by recent ship velocity.
How is this list of Mailu alternatives ranked?
Alternatives are ranked by Sparkpulse's velocity_score — release cadence + 30-day spark count + sector-relative ship rate.
Can I compare Mailu directly with one of these alternatives?
Yes — every card has a "Compare with Mailu" link to a side-by-side /compare page.