List of the Top 7 On-Prem Secure Email Gateway Software in 2025

Strengthening the protection of your email accounts is vital, as email continues to be the main conduit for various threats. It is important to expand your security strategies to detect dangerous threats proactively and to effectively respond to and manage emerging risks as they occur. Understanding the malicious strategies that can target your organization is crucial for prevention. By identifying the specific vulnerabilities your business faces and categorizing the threats, you can gain a clearer picture of which areas are most at risk of an attack. Employing AI-driven threat detection allows multiple systems to simultaneously scrutinize various elements of incoming emails. The data collected from these analyses ensures accurate threat identification, evaluates potential business risks, and aids in formulating appropriate response plans. Cyber threats can come from numerous sources, such as phishing attacks, business email compromises, malware infections, and ransomware invasions. Safeguard your organization against all these dangers by leveraging advanced threat intelligence, which empowers you to act swiftly against any emerging risks. Given the constant evolution of cyber threats, it is essential to stay one step ahead of potential attackers by adopting robust and comprehensive security solutions that evolve alongside the threat landscape. Additionally, regular training and awareness for employees can significantly bolster your defenses against these risks.

Fortinet emerges as a key global player in the cybersecurity sector, notable for its comprehensive and integrated approach to safeguarding digital infrastructures, devices, and applications. Founded in 2000, the organization provides a wide range of products and services, including firewalls, endpoint protection, intrusion prevention systems, and secure access solutions. A cornerstone of its offerings is the Fortinet Security Fabric, a unified platform that seamlessly combines various security tools to enhance visibility, automation, and provide real-time threat intelligence across the entire network. Renowned for its dependability among businesses, government agencies, and service providers worldwide, Fortinet prioritizes innovation, scalability, and performance, thereby reinforcing its defenses against the constantly shifting landscape of cyber threats. In addition to its protective capabilities, Fortinet’s dedication to enabling digital transformation and ensuring business continuity highlights its essential role within the cybersecurity landscape, positioning itself as a trusted partner for organizations striving to navigate modern security challenges effectively. With a focus on proactive measures and cutting-edge solutions, Fortinet continues to adapt and evolve to meet the demands of an increasingly complex digital world.

Protect the integrity of Microsoft Office 365, Google G Suite, and in-house email systems by deploying the industry's most effective email security solutions. Safeguard users from various threats, including spear phishing, credential compromise, and ransomware, by implementing Email Threat Isolation techniques. Address common email vulnerabilities such as spear phishing, ransomware, business email compromise, and spam with strong protective measures. Thwart spear phishing attempts through a layered defense system that includes threat isolation, spam filtering, advanced analytics, and user training initiatives. Shield against the latest ransomware threats by utilizing sophisticated content defense methods, sandboxing, and link protection technologies designed to detect new and hidden threats, including zero-day exploits. Counteract business email compromise by using impersonation safeguards, enforcing sender authentication, and applying brand protection tactics. Improve your brand's reputation and reduce risks by automating the enforcement of sender authentication methods like DMARC, DKIM, and SPF with Symantec Email Fraud Protection, which effectively tackles the challenges associated with email security. By adopting these comprehensive strategies, organizations not only protect their communications but also cultivate a security-conscious culture among their users, ultimately enhancing overall organizational resilience against email-based threats. Investing in these solutions is crucial for maintaining secure and trustworthy communication channels.

Sending and receiving digitally signed encrypted emails has become simpler than ever before. The Secure E-Mail Gateway (SEPPmail), utilizing its innovative GINA method for spontaneous encryption, is capable of safeguarding email communications for both small and large enterprises at the highest security levels. This solution requires very little effort and is user-friendly for both the sender and the recipient. SEPPmail’s all-encompassing Secure Email solution establishes new benchmarks in email communication that adheres to GDPR compliance. Recognized as a premier email encryption and signature solution, SEPPmail encompasses all essential features to protect sensitive data transmitted via email, while also ensuring the sender's authenticity and maintaining the confidentiality and integrity of the message. Additionally, the modular architecture of this secure email gateway enables customization to cater to specific customer requirements and allows for effortless expansion. As such, businesses can confidently rely on SEPPmail to enhance their email security protocols.

A quarter of the leading 100 German firms with the highest revenues opt for Zertificon's solutions. Our Z1 SecureMail Gateway simplifies Enterprise Email Encryption, ensuring secure communication with anyone, anytime. The entire organization can seamlessly encrypt, decrypt, manage, and verify email signatures in the background. Maintenance for the Z1 SecureMail Gateway is minimal, and the user-friendly, browser-based admin interface requires no specialized skills to operate. Automatic key management and centralized enforcement of security policies further enhance its efficiency. Quick and easy integration into either cloud or on-premises email systems means that your business operations remain uninterrupted. There is no need for employee training, and the experience for recipients is smooth and hassle-free. The Z1 SecureMail Gateway allows for centralized customization of encryption, minimizing the risk of human error. With this solution, you can swiftly achieve compliance and ensure the highest security standards. Additionally, you retain ownership of your encryption keys and benefit from German-engineered data sovereignty, free from backdoors, which enhances your organization’s trustworthiness and security posture. This comprehensive approach not only safeguards communications but also empowers your organization to focus on its core activities without security concerns.

Trend Micro™ InterScan™ Messaging Security delivers robust protection against both traditional and targeted cyber threats. Utilizing insights from the Trend Micro™ Smart Protection Network™ and the option for sandbox execution analysis, it effectively neutralizes spam, phishing scams, and advanced persistent threats (APTs). The platform is built on a hybrid Software as a Service (SaaS) model, combining a high-performance gateway virtual appliance with a cloud-based prefilter to intercept most threats and spam before they infiltrate the network, tackling issues right at their source. This hybrid model strikes a perfect balance between the privacy and control of an on-premises appliance and the resource efficiency and proactive security measures of cloud-based filtering. Additionally, the Data Privacy and Encryption Module is tailored to tackle regulatory compliance and data protection challenges, ensuring outbound information remains secure. Designed for ease of use, this optional module includes identity-based encryption and customizable data loss prevention (DLP) templates for swift implementation, thereby reinforcing the overall security infrastructure for businesses. Ultimately, this all-encompassing solution not only shields against a wide array of threats but also equips organizations with the tools to uphold compliance with data privacy laws, fostering greater trust and security. In conclusion, organizations can confidently rely on this offering to enhance their cybersecurity posture while navigating the complexities of regulatory requirements.

Protect your email infrastructure and users, whether they are hosted on-premises or in the cloud, by implementing Trellix Email Security. This solution is designed to identify and combat sophisticated email threats such as ransomware, business email compromise (BEC), and phishing attacks. With its exceptional detection and response features, you can create a reliable and resilient email system. The platform swiftly pinpoints ongoing threats and provides prioritized alerts, allowing security analysts to take immediate action. Maintain the safety of your email—whether cloud-based or on-premises—by utilizing cutting-edge sandbox technology, artificial intelligence, and machine learning. Furthermore, enhance your security environment by integrating with over 650 Trellix solutions and various third-party products, which can offer essential insights and support a unified security framework. By employing this on-premises solution, you can significantly diminish the chances of breaches while effectively identifying, isolating, and defending against intricate URL and attachment threats. Choose Advanced Threat mode for detecting harmful URLs through custom plug-ins, or opt for Full Hygiene mode to reduce impersonation attempts, BEC, and other vulnerabilities. These comprehensive features empower you to uphold a secure email landscape that is customized to meet the specific requirements of your organization, ensuring that your communications remain safeguarded against evolving threats.