As of September 2026, Latka tracks 4 email client software companies with $100M+ in annual revenue. They have combined revenues of $869.6M and employ 3.4K people. They have raised $202.1M and serve 18K customers combined.
Every company below sells email client software to other businesses and is ranked by its most recent annual revenue. Revenue, funding, headcount and customer figures come from CEO interviews on the Latka podcast, public company filings, and Latka estimates where a company has not disclosed a number.
Email client software enables users to access, manage, and send emails effectively. This software can function as a standalone application installed on a desktop or mobile device, or as a web-based service, offering flexibility based on user preferences. Common use cases include personal communication, business correspondence, and team collaboration, where users need organized access to multiple email accounts in one place. Typical features of email client software include the ability to send and receive emails, manage contacts, schedule calendar events, and organize messages through folders or tags. Additional functionalities may encompass spam filtering, email encryption, and integration with other productivity tools. The primary users of such software range from individual consumers to business professionals in roles such as administration, sales, marketing, and IT who require robust email management and communication capabilities.
Sorting: Highest -> Lowest
Showing 4 of 4 companies ranked by annual revenue.
San Francisco, California, United States
At Mozilla, we’re a global community of technologists, thinkers and builders working together to keep the Internet alive and accessible, so people worldwide can be informed contributors and creators of the Web. We believe this act of human collaboration across an open platform is essential to individual growth and our collective future.
New Taipei City, Taipei, Taiwan
Helping people and organizations manage, share, and protect their data regardless of scale, infrastructure, or expertise.
Latka tracks 4 email client software companies with $100M+ in annual revenue. Together they generate $869.6M in annual revenue and employ 3.4K people.
Mozilla is the largest, with $510.4M in annual revenue.
The average email client software company in this list makes $217.4M a year, across 4 companies with reported revenue. They serve 18K customers combined.
Ranked by annual revenue, the leaders are Mozilla, Redbrick, Synology and Front App.
The 4 email client software companies with $100M+ in annual revenue tracked here have raised $202.1M in disclosed funding between them.
- Must allow users to send and receive emails from one or multiple accounts - Should provide organization features such as folders, tags, or categories for managing emails - Must support integrations with calendar and contact management tools - Needs to offer enhanced security features, such as encryption and spam filtering - Not just for sending and receiving emails; must also provide tools for email management and organization - Should include a user-friendly interface for ease of use across different devices.
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