As of August 2026, Latka tracks 12 email security software companies with $10M–$100M in annual revenue. They have combined revenues of $374.7M and employ 2.5K people. They have raised $276M and serve 7M customers combined.
Every company below sells email security 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 Security Software is designed to protect organizations from a range of email-based threats, including phishing, spam, malware, and data breaches. These solutions provide essential features such as email filtering, encryption, threat intelligence, and security analytics to ensure the integrity and confidentiality of communications. The primary use cases include safeguarding sensitive data, ensuring compliance with regulations, and preserving reputational integrity by preventing unauthorized access to email systems. Typically, buyers of email security software include IT professionals, security teams, and compliance officers who seek to bolster their organization's defenses against evolving cyber threats. These tools are utilized across various industries and are vital for any entity reliant on email for business communication. Common workflows involve automated threat detection and response, real-time reporting, and user training to reduce potential risks associated with human error.
Sorting: Highest -> Lowest
Showing 10 of 12 companies ranked by annual revenue.
Geneva, Geneve, Switzerland
Developer of an online platform designed to provide a free web-based encrypted email service. The company's platform uses client-side encryption to protect emails and user data, enabling clients to get end-to-end encrypted email services anytime.
Geneva, Switzerland
ProtonMail was founded in 2013 by scientists who met at CERN and were drawn together by a shared vision of a more secure and private Internet. Since then, ProtonMail has evolved into a global effort to protect civil liberties and build a more secure Internet, with team members also hailing from Caltech, Harvard, ETH Zurich and many other research institutions.
Hem, France
Developer of a predictive email defense platform intended to improve email security. The company's platform leverages artificial intelligence, fed by data from 600 million mailboxes, to detect threats such as spam, malware and phishing links and block them in real-time, enabling enterprises to filter threat emails and increase their security.
München, Bayern, Germany
Digital transformation is changing processes and supply chains, products and companies, entire industries and markets. Retarus supports businesses, enabling adaptation to these changes. With cloud services for digital business communication that enable the efficient and secure exchange of information. For people, applications, and machines. This is how more efficient business processes are developed. Processes that work better, are more flexible, agile, and transparent. Technological advances are changing day-to-day business. Everywhere. And faster than ever. Companies must act, adapt their processes, use innovation to enhance their capabilities. Communication plays a vital role. It has to be secure. Fast. Reliable. And above all, digital. And automated. That’s exactly what has been driving Retarus since 1992. Founded on the idea of linking the LAN email system cc:Mail to the public CompuServe email network using the Retarus-developed software platform CIS:Link, Retarus is now one of the leading international providers of secure and high-performance communication for business-critical processes. Tailored to the needs of the upper middle market and international corporations. Providing cloud platforms that secure all relevant channels of business information exchange from a single source. From email and fax, to SMS and EDI. For all standards. For all industries. And ready today for what tomorrow’s business will demand. We are proud that the world’s most successful companies appreciate our contribution to their value creation relying on our services for their business communication. Our vision is to be the global leader for enterprise-level cloud solutions, enabling business communication in a reliable, efficient, and compliant manner.
Alpharetta, Georgia, United States
External data privacy solutions for improved cybersecurity (spear phishing and social engineering), boosted productivity, and reduced employee churn.
LORGUES, France
Publisher of SaaS email and archiving services. The company's electronic document management and back-up and archiving in SaaS mode include a backup appliance, Titan, integrated in a high-security box tested fireproof and equipped with Raid 1 mounted discs that can be used in private or hybrid cloud mode.
Atlanta, Georgia, United States
Developer of an automated platform intended to address the challenges of email phishing. The company's platform uses a combination of machine learning and human intelligence to offer phishing simulation training, detection, incidence responses and automated intelligence sharing, enabling organizations to protect themselves from the threat of phishing and make emails secure.
Latka tracks 12 email security software companies with $10M–$100M in annual revenue. Together they generate $374.7M in annual revenue and employ 2.5K people.
Proton AG is the largest, with $97.5M in annual revenue, founded in 2014.
The average email security software company in this list makes $31.2M a year, across 12 companies with reported revenue. They serve 7M customers combined.
Ranked by annual revenue, the leaders are Proton AG, Proton AG., Vade Secure, Egress Software Technologies and Retarus.
The 12 email security software companies with $10M–$100M in annual revenue tracked here have raised $276M in disclosed funding between them.
- Must provide automated email filtering to detect spam and phishing attempts - Should include features for email encryption to secure sensitive communications - Must offer threat intelligence capabilities to identify and mitigate emerging risks - Should support integration with existing email platforms and IT security tools - Must include reporting and analytics features for monitoring email security incidents - Not just focused on filtering; must also provide comprehensive threat response solutions - Should cater to various business sizes, from small businesses to large enterprises
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