The number one reason to choose our KumoMTA Email Servers is the powerful dedicated resources assigned to your instance. Every KumoMTA server comes with dedicated RAM, CPU cores, NVMe storage, and multiple IP addresses - critical for achieving millions of messages per hour throughput. No shared resources means no noisy neighbors throttling your delivery speeds.
Launch a fully configured KumoMTA instance with a single deployment. Pre-configured with community-maintained traffic shaping rules, automated IP warmup, DKIM signing, and bounce processing. Management perks include real-time metrics via Prometheus/Grafana dashboards, automatic traffic shaping automation (TSA), and webhook integrations - all in a performance-optimized environment.
Start with a basic plan supporting hundreds of thousands of messages per month. As your volume grows, effortlessly add domains, IP addresses and delivery rules to scale into the millions per hour. KumoMTA's Rust-based architecture means linear performance scaling - double your resources, double your throughput. No licensing penalties for growth, just predictable infrastructure costs.
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High Quality Servers
“I'm thrilled with their hosting services. The performance of my website has been exceptional, thanks to their top-notch hardware. Blazing-fast speeds and reliability have made a huge difference for my online presence.”
Fastest Hosting
"I'm amazed by the speed of their servers! My website loads in an instant, providing an exceptional user experience. Their hosting services have significantly boosted my site's performance."
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“Their products are simply amazing. The quality, features, and value they offer have elevated my online presence. A fantastic choice for anyone seeking top-tier hosting solutions.”
Five Star Hosting Services!
0003-02-12“Exceptional hosting services! Their robust infrastructure ensured my website's stability and lightning-fast loading times. Support was prompt and knowledgeable. A game-changer for my online business.“
Great Hosting Company
“Building my WordPress website was a breeze with their hosting services. The user-friendly setup and intuitive tools made the process seamless. I'm delighted with the hassle-free experience and impressive results.”
Very Helpful Support
“I'm thoroughly impressed with their hosting services. The standout feature for me is their outstanding customer support – quick, friendly, and incredibly helpful. They've truly exceeded my expectations!"
High Quality Servers
“I'm thrilled with their hosting services. The performance of my website has been exceptional, thanks to their top-notch hardware. Blazing-fast speeds and reliability have made a huge difference for my online presence.”
Fastest Hosting
"I'm amazed by the speed of their servers! My website loads in an instant, providing an exceptional user experience. Their hosting services have significantly boosted my site's performance."
Simply Amazing
“Their products are simply amazing. The quality, features, and value they offer have elevated my online presence. A fantastic choice for anyone seeking top-tier hosting solutions.”
Five Star Hosting Services!
0003-02-12“Exceptional hosting services! Their robust infrastructure ensured my website's stability and lightning-fast loading times. Support was prompt and knowledgeable. A game-changer for my online business.“
Great Hosting Company
“Building my WordPress website was a breeze with their hosting services. The user-friendly setup and intuitive tools made the process seamless. I'm delighted with the hassle-free experience and impressive results.”
Very Helpful Support
“I'm thoroughly impressed with their hosting services. The standout feature for me is their outstanding customer support – quick, friendly, and incredibly helpful. They've truly exceeded my expectations!"
High Quality Servers
“I'm thrilled with their hosting services. The performance of my website has been exceptional, thanks to their top-notch hardware. Blazing-fast speeds and reliability have made a huge difference for my online presence.”
Fastest Hosting
"I'm amazed by the speed of their servers! My website loads in an instant, providing an exceptional user experience. Their hosting services have significantly boosted my site's performance."
Simply Amazing
“Their products are simply amazing. The quality, features, and value they offer have elevated my online presence. A fantastic choice for anyone seeking top-tier hosting solutions.”
KumoMTA is a high-performance Message Transfer Agent (MTA) built in Rust. It accepts messages via SMTP or HTTP API injection, queues them by tenant/campaign/destination, applies traffic shaping rules per mailbox provider, and delivers via optimized SMTP connections. The Lua scripting engine handles routing decisions, DKIM signing, and throttle management in real-time. Messages flow through scheduled queues into ready queues, then out through your configured egress IP pools.
<p>Extremely accurate. KumoMTA uses community-maintained shaping rules for major mailbox providers (Gmail, Microsoft, Yahoo, etc.) combined with Traffic Shaping Automation (TSA) that monitors real-time SMTP responses. When providers signal "too many connections" or rate limits, KumoMTA automatically adjusts throttles per-domain without manual intervention. Rules update dynamically based on actual provider feedback.</p>
Yes. KumoMTA uses disk-based spooling (no RAM-only queuing) so messages survive server restarts. Deferred messages automatically retry based on configurable intervals - typically exponential backoff. Hard bounces are logged and removed from queue. You can monitor queue status via API, view detailed bounce logs, and messages persist until successfully delivered or aged out based on your retention policy.
Basic deployment: 15-30 minutes using package installation and policy helpers. Production-ready configuration with DKIM signing, traffic shaping, multi-tenant routing, and monitoring typically takes 1-2 hours. Complex multi-server clusters with custom Lua policies may require a day.
We perform a full 24-hour stability and performance test before releasing your server. This ensures DNS propagation, IP reputation baseline, and system optimization are all verified. Billing begins only at the point of delivery - you don't pay during our testing period. We offer fully managed setup with deployment guarantee.
A properly configured server delivers 7 million messages per hour in production - up to 4+ million per hour even on modest 8-core/16GB hardware. In direct testing, KumoMTA processed 100,000 messages in just over one minute versus 12 minutes for Postfix on identical hardware. Built in Rust for speed without RAM spooling shortcuts, so maximum throughput with no data loss risk. Performance scales linearly: double your resources, double your throughput.
Choose the email infrastructure provider who makes high-performance sending easy and fast to deploy. Production-ready with our 24-hour stability testing and setup guarantee - billing starts only at point of delivery..
