INDUSTRY ALERT

Hurricane MTA users:
Make your next move on your terms

This alert is for organizations currently running Hurricane MTA (SocketLabs' on-premises MTA). If you're searching for a Hurricane MTA alternative, evaluating a SocketLabs alternative, or wondering about the future of SocketLabs on-premises email infrastructure after the acquisition announcement, this alert explains the questions worth asking and what a migration to KumoMTA looks like.

On July 9, 2026, Infobip announced its acquisition of SocketLabs. While it clearly outlined the strategic value of SocketLabs' cloud email observability, routing, and deliverability analytics platform— it made no mention of Hurricane MTA, the on-premises Windows mail transfer agent, the product that started it all.

If you're running Hurricane MTA in production, you’re still waiting for clarity on how this acquisition will affect the product's future. This page is intended to help you calmly plan for the future in the meantime, answering the questions:

1
“what just happened?”
2
“what questions should I be asking my account rep?”
3
And if the roadmap — or lack of one — no longer aligns with your needs, “what would a migration to an open-source MTA look like?”

What actually happened (with receipts)

What was said: On July 9, 2026, Infobip, the Croatian CPaaS company, announced the acquisition of SocketLabs (terms undisclosed). Their stated rationale: integrate SocketLabs' "vendor-agnostic observability and intelligent routing" into Infobip's platform and its Email Deliverability Agent, so Infobip can, in its CEO's words, "sit across a customer's entire email operation." 

What was not said: Neither the announcement nor the coverage mentions Hurricane MTA, SocketLabs' on-premises Windows MTA, or any commitment to current on-prem customers. Absence of a statement is not an end-of-life notice. It is also not a roadmap.

Why this matters: Email infrastructure consolidations have followed a familiar pattern: the acquirer wants the cloud asset, and the licensed on-prem server software gradually loses investment, then support, then renewal terms. PowerMTA customers watched this after the Bird/MessageBird acquisition; Momentum customers after Message Systems/SparkPost/MessageBird. While we're not predicting Hurricane's fate — we are noting that "wait and see" is itself a decision that can come with a hefty cost.

 

5 questions to ask your rep before your next Hurricane renewal

Rather than waiting for additional public announcements, now is a good time to reach out to your rep to get answers to some important questions:
1
Is there a public, dated roadmap for Hurricane MTA under Infobip ownership?
2
What is the written support SLA commitment beyond the current contract terms?
3
Will license pricing and terms carry over at renewal, and for how long?
4

Who, specifically, is the engineering team maintaining Hurricane now, and did they come along in the acquisition?

5
If Hurricane is sunset in 12–24 months, what is the vendor's proposed migration path, and does it end with you owning less than you own today?
If you can't get clear answers to these questions, the risk isn't hypothetical, it just hasn’t been priced yet. The rest of this page prices it.

An honest comparison: 
Hurricane MTA vs KumoMTA

Organizations evaluating a Hurricane MTA alternative are often comparing not only throughput and deliverability performance, but also deployment flexibility, operational visibility, automation capabilities, and long-term infrastructure control.
Area / Feature
Hurricane MTA
KumoMTA
License
Commercial, per-server licensing
Apache-2.0 open source — free forever, no license keys
Roadmap control
Vendor-owned (currently: unstated)
Yours. The code can't be acquired, sunset, or repriced
Platform
Windows Server
Linux (RHEL/Rocky/Ubuntu packages) or Docker — runs on the hardware you already have
Performance
Established, single-node Windows performance
Millions of messages/hour on a single node (Rust core)
Traffic shaping
Per-domain throttling
Granular per-destination shaping, queues, and rate limits
Policy/routing logic
Configuration-driven
Full Lua policy engine — route, sign, throttle programmatically
DKIM / auth
Supported
Supported. DKIM, DMARC, TLS, ARC 
Engagement tracking
Built-in opens/clicks (HTTPS)
Easily incorporate 3rd party open/click, real-time webhook reporting
Support
Vendor support (post-acquisition SLA: ask)
Community (free) + commercial enterprise support from the KumoMTA team
Cost at renewal
Whatever the new owner decides
$0 license. Support contracts priced predictably


Here's the honest part:

Hurricane is a Windows product and KumoMTA is not. If your requirement is "a Windows-native MTA, forever," we're not your answer, but you should know that the market for Windows-native MTAs has continued to shrink, leaving fewer and fewer long-term choices.

If your requirement is "high-volume sending on infrastructure we control," then the platform question is smaller than it looks: KumoMTA deploys in Docker (including on your existing Windows hosts' hypervisor) or on a small Linux VM, so your team's actual work — IP strategy, shaping policy, DKIM, monitoring — transfers cleanly. Every migration off Hurricane goes somewhere new. The question is whether you migrate to another vendor's roadmap, or to your own.

An honest comparison:
Hurricane MTA vs KumoMTA

Organizations evaluating a Hurricane MTA alternative are often comparing not only throughput and deliverability performance, but also deployment flexibility, operational visibility, automation capabilities, and long-term infrastructure control.
Area
License
Hurricane MTA
Commercial, per-server licensing
KumoMTA
Apache-2.0 open source — free forever, no license keys
Area
Roadmap control
Hurricane MTA
Vendor-owned (currently: unstated)
KumoMTA
Yours. The code can't be acquired, sunset, or repriced
Area
Platform
Hurricane MTA
Windows Server
KumoMTA
Linux (RHEL/Rocky/Ubuntu packages) or Docker — runs on the hardware you already have
Area
Performance
Hurricane MTA
Established, single-node Windows performance
KumoMTA
Millions of messages/hour on a single node (Rust core)
Area
Traffic shaping
Hurricane MTA
Per-domain throttling
KumoMTA
Granular per-destination shaping, queues, and rate limits
Area
Policy/routing logic
Hurricane MTA
Configuration-driven
KumoMTA
Full Lua policy engine — route, sign, throttle programmatically
Area
DKIM / auth
Hurricane MTA
Supported
KumoMTA
Supported. DKIM, DMARC, TLS, ARC
Area
Engagement tracking
Hurricane MTA
Built-in opens/clicks (HTTPS)
KumoMTA
Easily incorporate 3rd party open/click, real-time webhook reporting
Area
Support
Hurricane MTA
Vendor support (post-acquisition SLA: ask)
KumoMTA
Community (free) + commercial enterprise support from the KumoMTA team
Area
Cost at renewal
Hurricane MTA
Whatever the new owner decides
KumoMTA
$0 license. Support contracts priced predictably

Here’s the honest part:

Hurricane is a Windows product and KumoMTA is not. If your requirement is "a Windows-native MTA, forever," we're not your answer, but you should know that the market for Windows-native MTAs has continued to shrink, leaving fewer and fewer long-term choices.

If your requirement is "high-volume sending on infrastructure we control," then the platform question is smaller than it looks: KumoMTA deploys in Docker (including on your existing Windows hosts' hypervisor) or on a small Linux VM, so your team's actual work — IP strategy, shaping policy, DKIM, monitoring — transfers cleanly. Every migration off Hurricane goes somewhere new. The question is whether you migrate to another vendor's roadmap, or to your own.

What a migration to KumoMTA looks like

Week 1: Parallel install
Stand up KumoMTA in Docker or on a Linux VM. Import your sending domains, DKIM keys, and IP pools. Nothing about your Hurricane implemention changes at this stage.
Week 2: Policy translation
Map Hurricane's per-domain throttling and routing rules into KumoMTA's shaping config and Lua policy. (This is where our team or the community earns its keep — bring your config.)
Weeks 2–4: Warm parallel traffic

Shift a low-stakes mail stream (a subdomain, one tenant, internal notifications) to KumoMTA in your existing network. Compare delivery logs, tune shaping. Your existing IPs keep their reputation — you're changing software, not identity.

Weeks 4–8: Staged cutover
Move volume tenant-by-tenant or domain-by-domain, Hurricane still running as fallback. Decommission when the graphs say so, not when a license deadline forces it.

Why teams pick KumoMTA

 
✓
Built by veteran MTA engineers who spent decades building, deploying, and supporting high-performance MTAs for the world’s largest senders
✓
Open-source core that cannot be acquired out from under you. You own the product and can customize, modify and integrate with other solutions to meet your needs
✓

Performance that consolidates hardware rather than expanding it

✓
Commercial support with a real SLA. The difference is you choose the relationship annually, it doesn't own your infrastructure

Why teams pick KumoMTA

✓
Built by veteran MTA engineers who spent decades building, deploying, and supporting high-performance MTAs for the world’s largest senders
✓
Open-source core that cannot be acquired out from under you. You own the product and can customize, modify, and integrate with other solutions to meet your needs
✓
Performance that consolidates hardware rather than expanding it
✓
Commercial support with a real SLA. The difference is you choose the relationship annually; it doesn't own your infrastructure
⌕
Frequently asked questions
Is Hurricane MTA end of life / discontinued?
⌄

No. As of publication, Infobip has made no public statement about Hurricane MTA's future. This page exists because the acquisition announcement focused entirely on SocketLabs' cloud products, leaving Hurricane MTA customers facing an uncertain future.

Is KumoMTA really free? ⌄

Yes — Apache-2.0 licensed, no license keys, no per-message fees, no volume tiers. Enterprise support subscriptions are optional and priced predictably.

We're a Windows shop. Is this realistic? ⌄
KumoMTA runs in Docker or on a Linux VM — most Hurricane operators already run virtualization that hosts either without new hardware. Your deliverability practices carry over; the OS underneath the MTA changes. If Windows-native is a hard requirement, we'll tell you honestly that KumoMTA isn't a fit.
Can we keep our IP reputation through a migration? ⌄

Yes — reputation attaches to your IPs and domains, not your MTA software. The staged-parallel approach above is specifically designed to preserve it.

What does migration help cost?
 ⌄
Community help is free. Scoped migration assistance and enterprise support are quoted per engagement — talk to us. 
Don't "wait and see"
Plan your next move now, on your terms. You’ve got nothing to lose but a little fear, uncertainty, and doubt.
Get the 2026
MTA Buyer’s Guide Make infrastructure decisions with clarity and confidence.
Get the guide
⌕
Frequently Asked Questions
Is Hurricane MTA end of life / discontinued? ⌃
No. As of publication, Infobip has made no public statement about Hurricane MTA's future. This page exists because the acquisition announcement focused entirely on SocketLabs' cloud products, leaving Hurricane MTA customers facing an uncertain future.
Is KumoMTA really free? ⌃
Yes — Apache-2.0 licensed, no license keys, no per-message fees, no volume tiers. Enterprise support subscriptions are optional and priced predictably.
We're a Windows shop. Is this realistic? ⌃
KumoMTA runs in Docker or on a Linux VM — most Hurricane operators already run virtualization that hosts either without new hardware. Your deliverability practices carry over; the OS underneath the MTA changes. If Windows-native is a hard requirement, we'll tell you honestly that KumoMTA isn't a fit.
Can we keep our IP reputation through a migration? ⌃
Yes — reputation attaches to your IPs and domains, not your MTA software. The staged-parallel approach above is specifically designed to preserve it.
What does migration help cost? ⌃
Community help is free. Scoped migration assistance and enterprise support are quoted per engagement — talk to us.
Don't "wait and see"
Plan your next move now, on your terms. You’ve got nothing to lose but a little fear, uncertainty, and doubt.
Get the 2026 MTA Buyer’s Guide Make infrastructure decisions with clarity and confidence.
Get the guide