Average Ratings 4 Ratings

Total
ease
features
design
support

Average Ratings 0 Ratings

Total
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support

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Description

KumoMTA is an open source mail transfer agent and email infrastructure platform for enterprises, MailOps teams, and high-volume senders. The platform is built to provide the control, scalability, transparency, and continuity that organizations need when email delivery is central to their business. KumoMTA is positioned as an alternative to commercially licensed MTA providers that may create pricing shocks, renewal risk, vendor dependency, or black-box infrastructure limitations. The platform can deliver tens of millions of messages per hour on a single instance and is designed to support large-scale sending without data loss. Its open source model gives teams direct access to the code and more authority over deployment, operations, and long-term infrastructure decisions. KumoMTA also emphasizes performance, resilience, cost predictability, fairness, and transparent stewardship. The community includes developers, security researchers, and enterprises that help audit code, identify vulnerabilities, and improve the platform over time. KumoMTA provides extensive documentation, a community forum, GitHub repository, migration resources, and support options for teams moving from other MTA platforms. By combining open source email infrastructure, high-volume performance, operational control, community development, documentation, and enterprise support, KumoMTA helps organizations invest in their own email infrastructure with greater confidence.

Description

Sendio's Opt-Inbox is an innovative sender management mechanism that filters messages that have passed through email security, preventing unwanted communications from cluttering a user's inbox and allowing only messages from preferred contacts or subscriptions. This system addresses the common problem of inboxes being overwhelmed by a barrage of cleared messages, which often include relentless sales pitches, marketing content, and bulk emails. As a result, distinguishing between harmful emails and those that might be relevant or useful has become increasingly challenging. This scenario can pose significant challenges for busy executives and professionals who cannot afford to miss critical communications, risking the chance of overlooking an important email among the chaos of their quarantine queue. Ultimately, the Opt-Inbox ensures that users maintain control over their email experience, allowing them to focus on what truly matters without unnecessary distractions.

API Access

Has API Yes 

API Access

Has API No 

Screenshots View All

Screenshots View All

Integrations

Ongage Yes 
Postmastery Yes 
Prometheus Yes 

Integrations

Ongage No 
Postmastery No 
Prometheus No 

Pricing Details

$0
KumoMTA is Open-Source and free to use, those interested in support and services can contact us.
Free Trial Yes 
Free Version Yes 

Pricing Details

$795 per year
Free Trial Yes 
Free Version No 

Deployment

Web-Based Yes 
On-Premises Yes 
iPhone App No 
iPad App No 
Android App No 
Windows No 
Mac No 
Linux Yes 
Chromebook No 

Deployment

Web-Based Yes 
On-Premises No 
iPhone App No 
iPad App No 
Android App No 
Windows No 
Mac No 
Linux No 
Chromebook No 

Customer Support

Business Hours Yes 
Live Rep (24/7) Yes 
Online Support Yes 

Customer Support

Business Hours Yes 
Live Rep (24/7) Yes 
Online Support Yes 

Types of Training

Training Docs Yes 
Webinars Yes 
Live Training (Online) Yes 
In Person Yes 

Types of Training

Training Docs Yes 
Webinars Yes 
Live Training (Online) Yes 
In Person No 

Vendor Details

Company Name

Kumo Corp

Founded

2023

Country

United States

Website

kumomta.com

Vendor Details

Company Name

Sendio

Founded

2003

Country

United States

Website

sendio.com/products/opt-inbox/

Product Features

Email Management

Data Recovery No 
Email Archiving Yes 
Email Deletion No 
Email Discovery No 
Email Monitoring Yes 
Email Recall No 
Queue Manager Yes 
Response Management No 
Routing Yes 
Shared Inboxes No 
Signature Management No 
Spam Blocker No 
Whitelisting / Blacklisting Yes 

Product Features

Email Management

Data Recovery Yes 
Email Archiving Yes 
Email Deletion No 
Email Discovery No 
Email Monitoring No 
Email Recall No 
Queue Manager Yes 
Response Management No 
Routing Yes 
Shared Inboxes No 
Signature Management No 
Spam Blocker Yes 
Whitelisting / Blacklisting No 

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