
Postfix
Halon MTA
PowerMTA
MailerQ
Exim
Sendmail
GreenArrow Engine
KumoMTA is the world's first Open-Source MTA designed from the ground-up for large-volume senders. Get a fast, flexible, supported solution.

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Which is more popular?
Based on our record, KumoMTA seems to be more popular. It has been mentioned 1 time since March 2021.
Website, pricing, platforms and company facts side by side.
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| Website | kumomta.com | diffee.me |
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| Company | 2023 | — |
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In their own words, as submitted to SaaSHub.


The History of KumoMTA KumoMTA is an open source Message Transfer Agent (MTA) designed to provide high performance outbound email functionality. The KumoMTA project was founded by a group of email industry veterans with decades of experience building and managing high-performance On-Prem MTAs and...
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What each product offers, as listed by its team.


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As answered by people managing KumoMTA and Diffee.
KumoMTA's answer
KumoMTA is the only high-performance, highly flexible MTA built for senders that is Open-Source with a free license.
KumoMTA's answer
KumoMTA was built by a team of industry veterans to address a need in the market for an Open-Source solution that has the performance and flexibility of the commercial MTA offerings but without the restrictive licensing that the industry has grown weary of.
KumoMTA's answer
KumoMTA is built on Rust, with Lua used for its Config as Code engine, making extensive customization and integrations straightforward while providing extreme performance and safety.
KumoMTA's answer
When an organization needs to send up to millions of messages per hour, or needs deep integration in a modern DevOps environment, but doesn't want to be bound by restrictive license agreements and mandatory annual fees.
KumoMTA's answer
KumoMTA's answer
High-volume multi-tenant senders.
Share your experience with using KumoMTA and Diffee. For example, how are they different and which one is better?
Recommendations tracked on public social media and blogs since March 2021.


I've been using KumoMTA for the past 3 months and it's one of the most well thought-out, stable and fast softwares I've ever used. https://kumomta.com/. - Source: Hacker News / over 2 years ago
Tracking Diffee since Mar 2021.
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