Best On-Premises Secure Email Gateway Software of 2025

Enhanced measures to protect your email accounts are essential, as email remains the primary vector for threats. It is crucial to broaden your security measures to identify hazardous threats and swiftly respond to and mitigate new dangers as they arise. Recognizing the malicious tactics employed in assaults on your organization is vital. By understanding the unique risks to your business and classifying the threats, you can better comprehend which aspects of your organization are most susceptible to attacks. Utilizing AI-based threat detection, various detection systems concurrently analyze different components of incoming emails. The insights gained from these evaluations ensure precise threat identification, assess business risks, and facilitate suitable response strategies. Threats may originate from a variety of channels, including phishing schemes, business email compromise, malware, and ransomware. Protect yourself against all these threats with top-tier threat intelligence, which equips you to respond promptly to any potential risks. The continuous evolution of cyber threats makes it imperative to stay ahead of attackers by implementing comprehensive security solutions.

Fortinet stands out as a prominent global entity in the realm of cybersecurity, recognized for its all-encompassing and cohesive strategy aimed at protecting digital infrastructures, devices, and applications. Established in the year 2000, the company offers an extensive array of products and services, which encompass firewalls, endpoint security, intrusion prevention systems, and secure access solutions. Central to its offerings is the Fortinet Security Fabric, a holistic platform that effectively melds various security tools to provide enhanced visibility, automation, and real-time intelligence regarding threats across the entire network. With a reputation for reliability among businesses, governmental bodies, and service providers across the globe, Fortinet places a strong emphasis on innovation, scalability, and performance, thereby ensuring a resilient defense against the ever-evolving landscape of cyber threats. Moreover, Fortinet’s commitment to facilitating digital transformation and maintaining business continuity further underscores its role as a pivotal player in the cybersecurity industry.

Ensure the security of Microsoft Office 365, Google G Suite, and on-premises email systems by utilizing the most comprehensive email security solution available in the industry. Shield users from threats like spear phishing, credential theft, and ransomware attacks through the implementation of Email Threat Isolation. Combat pervasive email hazards such as spear phishing, ransomware, business email compromise, and spam with robust protective measures. Foil spear phishing attempts through a multi-layered defense that includes threat isolation, spam filtration, advanced email security analytics, and integrated user training and awareness programs. Defend against the latest ransomware attacks with advanced content defense strategies, sandboxing techniques, and link protection technologies that are designed to identify emerging and stealthy threats, including zero-day vulnerabilities. Counter business email compromise by employing impersonation protection, enforcing sender authentication, and implementing brand protection strategies. Enhance your brand's reputation and mitigate risks by automating the enforcement of sender authentication protocols like DMARC, DKIM, and SPF through the use of Symantec Email Fraud Protection, which addresses the practical challenges of maintaining email security effectively. By investing in these comprehensive solutions, organizations can safeguard their communications while fostering a culture of security awareness among users.

It is now easier than ever to send and receive digitally signed encrypted emails. The Secure E-Mail Gateway (SEPPmail) with its patented GINA procedure for spontaneous encrypted, SMEs as well as large corporations can secure all e-mail communications at the highest level. It requires minimal effort and is easy to use for both sender and receiver. SEPPmail's comprehensive Secure Email solution sets new standards in secure, GDPR-compliant email communication. SEPPmail is a world-class email encryption and signature solution. It includes all the features necessary to protect confidential data via email, ensure authenticity of the sender, and ensure confidentiality and integrity of the message. The modular design of the secure email gateway solution allows it to be customized to meet customer needs and can be easily expanded.

25% of the top 100 German companies with the highest turnover choose Zertificon's solutions. We make Enterprise Email Encryption effortless for secure communications with anyone, anywhere, with our Z1 SecureMail Gateway solution. Your entire organization encrypts and decrypts, just as well manages and verifies email signatures smoothly in the background. Z1 SecureMail Gateway requires very little maintenance. Furthermore, the browser-based admin interface does not call for any special skills. Keys are managed automatically, and security policies are centrally enforced. Integration into your cloud or on-premises email infrastructure is quick and straightforward. Your business and workflows are uninterrupted – no employee training is required, and recipients get a frictionless experience. Encryption is centrally customizable and proofed against human error with Z1 SecureMail Gateway. You can quickly establish and maintain compliance and the highest levels of security. You also own your encryption keys and get German-engineered data sovereignty with no backdoors.

Trend Micro™ InterScan™ Messaging Security offers extensive defense against both conventional and targeted cyber threats. By leveraging the integrated intelligence from Trend Micro™ Smart Protection Network™ along with optional sandbox execution analysis, it effectively eliminates spam, phishing attempts, and advanced persistent threats (APTs). The solution features a hybrid SaaS deployment model that merges a high-performance gateway virtual appliance with a cloud-based prefilter, which effectively intercepts most threats and spam before they reach the network—addressing issues right at their origin. This hybrid approach provides a balanced combination of the privacy and control associated with an on-premises appliance while enjoying the resource efficiency and proactive safeguards offered by cloud-based filtering. Furthermore, the Data Privacy and Encryption Module addresses the most challenging regulatory compliance issues and data protection requirements by ensuring the security of outbound information. This optional module is designed to be user-friendly, featuring identity-based encryption and customizable data loss prevention (DLP) templates to facilitate rapid implementation, thereby enhancing the overall security framework for businesses. Overall, this comprehensive solution not only protects against diverse threats but also empowers organizations to maintain compliance with data privacy regulations.

Safeguard your email systems and users, regardless of whether they are on-premises or cloud-based. Utilize Trellix Email Security to detect and counter advanced email threats such as ransomware, business email compromise (BEC), and phishing. With top-tier detection and response capabilities, you can establish a trustworthy and resilient email environment. The system quickly identifies current threats with prioritized alerts, enabling analysts to respond promptly. Ensure your email remains secure—whether it's on-premises or cloud-hosted—by leveraging advanced sandbox technology, artificial intelligence, and machine learning. Additionally, integrate with up to 650 Trellix solutions and third-party products to provide valuable insights and foster a cohesive security ecosystem. Reduce the likelihood of breaches while identifying, isolating, and defending against sophisticated URL and attachment-based attacks using this on-premises solution. Opt for Advanced Threat mode to discover harmful URLs through custom plug-ins, or select Full Hygiene mode to mitigate impersonation attempts, BEC, and other risks. With these robust features, you can maintain a secure email environment tailored to your organization's needs.