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Respond.io upgraded its AI Agents to GPT-5.6 and added TikTok Business Messaging for US accounts.
Alternatives · team communication tools
Mailu alternatives
The best Mailu alternatives in team communication tools, ranked by Sparkpulse's velocity_score.
Updated Sep 14, 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
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.
Velocity 5.0 · Last update 1mo 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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Zoho Cliq 7.0 bets on AI conversation summaries and Neat hardware to close the gap with enterprise messaging platforms
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Salesmsg now runs the entire sales-to-NPS loop in one thread — outbound, AI reply, booking, survey, and routing.
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FluentBooking 2.4.0 opens the booking system to AI agents via MCP — the most directional release since the plugin launched.
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Stalwart adds full SCIM v2 provisioning and 24-language calendar support as its standards coverage extends further than most commercial mail servers.
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Bandwidth ships Identity Presentation (branded calling) in beta — trust layer for enterprise outbound calling.
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Slack raises the Marketplace bar back to ten installs while the agent platform consolidates.
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Rocket.Chat finishes the 8.8 calling work while the licence wall for SSO gets a date.
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The final v1.x release slipped by one patch, but the v2 deadline stands.
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Krisp adds deepfake detection and expands Voice Translation as its Call Center AI platform deepens enterprise compliance tools.
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Netcore's recent entries are blog content, not product releases — the signal is a BFSI and ecommerce vertical sales push.
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Canary Mail ships AI chat history while sustaining a cross-platform bug fix cadence.
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 | maintenance-branchroundcubecve-patching | — |
| Respond.io | 7.5 | 0 | customer-messagingai-agentsomnichannel | — |
| Zoho Cliq | 6.3 | 1 | ai-messagingenterprise-collaborationzoho-suite | AI that moves work forward: Inside Zoho Cliq 7.0 |
| Salesmsg | 6.3 | 0 | sms-salesai-agentscustomer-feedback | Collect and Act on Customer Feedback Right Inside Salesmsg with Surveys |
| FluentBooking | 6.3 | 1 | mcpai-agentsbooking | Introducing MCP for AI Agents – FluentBooking 2.4.0 |
| Stalwart | 6.3 | 1 | email-serverscimjmap | v0.16.20 |
| Bandwidth | 6.3 | 0 | voipcommunications-apircs | Identity Presentation – Beta |
| Slack | 6.3 | 1 | agentsmcpdeveloper-platform | Announcing Slack Code |
| Rocket.Chat | 6.3 | 1 | team-chatvoice-callingscreen-sharing | 8.8.0-rc.0: LDAP/SAML go Premium in 9.0, forced private-room E2EE |
| Apprise | 6.3 | 1 | notificationsmajor-versiondeprecation | Last release of the v1.x line — pin before v2 breaks |
| Krisp | 5.0 | 0 | call-center-aivoice-translationaccent-conversion | — |
| Netcore Cloud | 5.0 | 0 | marketing-automationbfsiemail-deliverability | — |
| Canary Mail | 5.0 | 0 | emailprivacyai-chat | — |
The 12 best Mailu alternatives, in depth
1. Respond.io · velocity 7.5
Respond.io upgraded its AI Agents to GPT-5.6 and added TikTok Business Messaging for US accounts.
Its velocity score of 7.5/10 reflects longer-term release cadence.
Where Mailu leans on maintenance branch, roundcube and cve patching, Respond.io focuses on customer messaging, ai agents and omnichannel.
Respond.io and Mailu have shipped at a similar pace over the last 30 days, so the decision comes down to fit and feature depth.
Full Respond.io trajectory → · Compare Mailu vs Respond.io →
2. Zoho Cliq · velocity 6.3
Zoho Cliq 7.0 bets on AI conversation summaries and Neat hardware to close the gap with enterprise messaging platforms.
Over the last 30 days Zoho Cliq shipped 1 meaningful update vs Mailu's 0, most recently “AI that moves work forward: Inside Zoho Cliq 7.0”. Its velocity score of 6.3/10 blends that with longer-term release cadence.
Where Mailu leans on maintenance branch, roundcube and cve patching, Zoho Cliq focuses on ai messaging, enterprise collaboration and zoho suite.
Over the last 30 days Zoho Cliq has been shipping faster than Mailu — a point in its favour if release momentum matters to you.
3. Salesmsg · velocity 6.3
Salesmsg now runs the entire sales-to-NPS loop in one thread — outbound, AI reply, booking, survey, and routing.
Its velocity score of 6.3/10 reflects longer-term release cadence; its most recent meaningful update was “Collect and Act on Customer Feedback Right Inside Salesmsg with Surveys”.
Where Mailu leans on maintenance branch, roundcube and cve patching, Salesmsg focuses on sms sales, ai agents and customer feedback.
Salesmsg and Mailu have shipped at a similar pace over the last 30 days, so the decision comes down to fit and feature depth.
4. FluentBooking · velocity 6.3
FluentBooking 2.4.0 opens the booking system to AI agents via MCP — the most directional release since the plugin launched.
Over the last 30 days FluentBooking shipped 1 meaningful update vs Mailu's 0, most recently “Introducing MCP for AI Agents – FluentBooking 2.4.0”. Its velocity score of 6.3/10 blends that with longer-term release cadence.
Where Mailu leans on maintenance branch, roundcube and cve patching, FluentBooking focuses on mcp, ai agents and booking.
Over the last 30 days FluentBooking has been shipping faster than Mailu — a point in its favour if release momentum matters to you.
Full FluentBooking trajectory → · Compare Mailu vs FluentBooking →
5. Stalwart · velocity 6.3
Stalwart adds full SCIM v2 provisioning and 24-language calendar support as its standards coverage extends further than most commercial mail servers.
Over the last 30 days Stalwart shipped 1 meaningful update vs Mailu's 0, most recently “v0.16.20”. Its velocity score of 6.3/10 blends that with longer-term release cadence.
Where Mailu leans on maintenance branch, roundcube and cve patching, Stalwart focuses on email server, scim and jmap.
Over the last 30 days Stalwart has been shipping faster than Mailu — a point in its favour if release momentum matters to you.
6. Bandwidth · velocity 6.3
Bandwidth ships Identity Presentation (branded calling) in beta — trust layer for enterprise outbound calling.
Its velocity score of 6.3/10 reflects longer-term release cadence; its most recent meaningful update was “Identity Presentation – Beta”.
Where Mailu leans on maintenance branch, roundcube and cve patching, Bandwidth focuses on voip, communications api and rcs.
Bandwidth and Mailu have shipped at a similar pace over the last 30 days, so the decision comes down to fit and feature depth.
7. Slack · velocity 6.3
Slack raises the Marketplace bar back to ten installs while the agent platform consolidates.
Over the last 30 days Slack shipped 1 meaningful update vs Mailu's 0, most recently “Announcing Slack Code”. Its velocity score of 6.3/10 blends that with longer-term release cadence.
Where Mailu leans on maintenance branch, roundcube and cve patching, Slack focuses on agents, mcp and developer platform.
Over the last 30 days Slack has been shipping faster than Mailu — a point in its favour if release momentum matters to you.
8. Rocket.Chat · velocity 6.3
Rocket.Chat finishes the 8.8 calling work while the licence wall for SSO gets a date.
Over the last 30 days Rocket.Chat shipped 1 meaningful update vs Mailu's 0, most recently “8.8.0-rc.0: LDAP/SAML go Premium in 9.0, forced private-room E2EE”. Its velocity score of 6.3/10 blends that with longer-term release cadence.
Where Mailu leans on maintenance branch, roundcube and cve patching, Rocket.Chat focuses on team chat, voice calling and screen sharing.
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 →
9. Apprise · velocity 6.3
The final v1.x release slipped by one patch, but the v2 deadline stands.
Over the last 30 days Apprise shipped 1 meaningful update vs Mailu's 0, most recently “Last release of the v1.x line — pin before v2 breaks”. Its velocity score of 6.3/10 blends that with longer-term release cadence.
Where Mailu leans on maintenance branch, roundcube and cve patching, Apprise focuses on notifications, major version and deprecation.
Over the last 30 days Apprise has been shipping faster than Mailu — a point in its favour if release momentum matters to you.
10. Krisp · velocity 5.0
Krisp adds deepfake detection and expands Voice Translation as its Call Center AI platform deepens enterprise compliance tools.
Its velocity score of 5.0/10 reflects longer-term release cadence.
Where Mailu leans on maintenance branch, roundcube and cve patching, Krisp focuses on call center ai, voice translation and accent conversion.
Krisp 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's recent entries are blog content, not product releases — the signal is a BFSI and ecommerce vertical sales push.
Its velocity score of 5.0/10 reflects longer-term release cadence.
Where Mailu leans on maintenance branch, roundcube and cve patching, Netcore Cloud focuses on marketing automation, bfsi and email deliverability.
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. Canary Mail · velocity 5.0
Canary Mail ships AI chat history while sustaining a cross-platform bug fix cadence.
Its velocity score of 5.0/10 reflects longer-term release cadence.
Where Mailu leans on maintenance branch, roundcube and cve patching, Canary Mail focuses on email, privacy and ai chat.
Canary Mail and Mailu have shipped at a similar pace over the last 30 days, so the decision comes down to fit and feature depth.
Full Canary Mail trajectory → · Compare Mailu vs Canary Mail →
Frequently asked questions
What are the best alternatives to Mailu?
The top Mailu alternatives we currently track in team communication tools are Respond.io, Zoho Cliq, Salesmsg, FluentBooking, Stalwart, 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.