Top 63 Email Security Software SaaS Companies in May 2026
As of May 2026, there are 63 SaaS companies in Email Security Software. They have combined revenues of $1B and employ 7.7K people. They have raised $1.5B and serve 7.1M customers combined.
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.
Barracuda is a leading cybersecurity company providing complete protection against complex threats. Our platform protects email, data, applications and networks with innovative solutions, and a managed XDR service, to strengthen cyber resilience. Hundreds of thousands of IT professionals and managed service providers worldwide trust us to protect and support them with solutions that are easy to buy, deploy, and use. For more information, visit barracuda.com.
Abnormal Security is the leading AI-native human behavior security platform, leveraging machine learning to stop sophisticated inbound attacks and detect compromised accounts across email and connected applications.
Kiteworks is a cybersecurity company that provides secure communication and file-sharing solutions for businesses and organizations. It secures sensitive content communications over channels such as email and file transfer.
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.
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.
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.
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.
- 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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