hMailServer
4.0 out of 5 starsKumoMTA
5.0 out of 5 starsRatings and Reviews 1 Rating
Ratings and Reviews 4 Ratings
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What is hMailServer?
hMailServer is a free and open-source email server specifically designed for the Microsoft Windows operating system. Its user base spans across the globe, encompassing internet service providers, various businesses, government agencies, educational facilities, and tech-savvy individuals.
Supporting standard email protocols like IMAP, SMTP, and POP3, it easily integrates with many existing webmail platforms. Furthermore, it offers a customizable spam protection system based on scoring and can be paired with virus scanners to rigorously inspect all incoming and outgoing messages for potential threats. This adaptability and robust feature set contribute to hMailServer's reputation as a trusted and effective email solution for diverse users. Most importantly, its wide range of functionalities enhances email security, making it a preferred option for many.
What is KumoMTA?
KumoMTA is an open source email infrastructure platform designed for enterprises, email service providers, and high-volume senders that need scalable, transparent, and controllable MTA technology. The platform is built for organizations that want to own their email sending infrastructure rather than depend on closed commercial systems. KumoMTA emphasizes performance, with the ability to send tens of millions of messages per hour on a single instance. It is designed to provide the scalability and resilience needed for large-scale email operations without sacrificing visibility or control. Because the platform is open source, teams can inspect the code, understand how the system works, and maintain authority over their deployment. KumoMTA is positioned around long-term stability, cost predictability, fair pricing, operational control, and reduced exposure to vendor lock-in or surprise renewal changes. The platform is supported by a growing community of developers, security researchers, enterprises, and MailOps professionals who contribute to innovation, auditing, vulnerability identification, and ongoing improvement. KumoMTA provides extensive documentation, community resources, a GitHub repository, migration guidance, and support options for teams evaluating or replacing existing MTA infrastructure. Its resources include migration information for platforms such as Hurricane MTA, Momentum, PowerMTA, and SendGrid. The platform is built for teams that need confidence in their email architecture, predictable infrastructure decisions, and the ability to send at massive scale. By combining open source MTA technology, high-volume delivery, code transparency, community stewardship, enterprise support, documentation, and migration resources, KumoMTA helps organizations modernize email infrastructure while keeping control of their operations.
Integrations Supported
AWS Marketplace
Azure Marketplace
Roundcube
SquirrelMail
API Availability
API Availability
Has API
Pricing Information
Free
Open source
Free Version
Pricing Information
$0
KumoMTA is Open-Source and free to use, those interested in support and services can contact us.
Free Version
Free Trial Offered?
Supported Platforms
Windows
Supported Platforms
SaaS
On-Prem
Linux
Customer Service / Support
Not specified
Customer Service / Support
Standard Support
24 Hour Support
Web-Based Support
Training Options
Documentation Hub
Training Options
Documentation Hub
Webinars
Online Training
On-Site Training
Company Facts
Organization Name
hMailServer
Date Founded
2002
Company Website
www.hmailserver.com
Company Facts
Organization Name
Kumo Corp
Date Founded
2023
Company Location
United States
Company Website
kumomta.com
Categories and Features
Mail Servers
Not specified
Categories and Features
Email Management
Email Archiving
Email Monitoring
Queue Manager
Routing
Whitelisting / Blacklisting
Mail Servers
Not specified