So much more than anti-spam: the most effective and accurate email security solution available today

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The EnGarde Email Security Gateway: Comprehensive Email Security for Every Environment

  • Devotion to our customers is the foundation of everything we do
  • We are innovative open-source security pioneers
  • Engineers of next-generation email security solutions

Guardian Digital understands that security is not just an IT issue or an afterthought — it's a boardroom issue that’s fundamental to today's business success.  Guardian Digital has a deep understanding of the email threats that companies face today and the circumstances that can result from just one security breach. It's a rapidly growing concern for any size company in any industry.

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Our Email Security Solution

For nearly 20 years, our company has developed and implemented cutting-edge secure cyber solutions using our flexible and cost-effective open-source platform.  These efforts have been employed to protect some of the largest companies in the world. Now, we’re using that experience to focus exclusively on our email protection solution: the EnGarde Email Security Gateway.

Leveraging the benefits of open source development, contemporary cloud technologies, and decades of combined experience protecting enterprises, Guardian Digital engineers have created EnGarde to be the email protection solution that's unparalleled by any other in the industry. 

Guardian Digital will run EnGarde and support all of your internet email infrastructure. Our goal is to provide best-in-class care for all our customers and to build our relationships based on the highest level of expertise, knowledge, and trust.

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Preventing Threats

The global security threat landscape is constantly changing.  High-tech hackers use increasingly sophisticated and coordinated attacks on email systems, including botnets, blended malware threats, and zero-day and other advanced targeted attacks.

Organizations deserve an advanced email security solution that will provide protection from even the most hostile networks. They also need this solution to be scalable and affordable. The EnGarde Email Security Gateway is the answer. It provides real-time intelligence, comprehensive protection from known and unknown threats, effective defenses against viruses, and protection against phishing and spoofing attacks. Since open-source software is adaptable by its very nature, the advanced machine-learning technology inherent to EnGarde detects and combats new email spam threats in real time.

Guardian Digital outperformed competitive products in both cost-effectiveness and ease of management. Our decision was clear.

Richard Wilson, Technology Director, Itasca Independent School District

EnGarde’s Key Product Features and Benefits

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Ease of Use

Our sophisticated and user-friendly web administration system provides a consistent and reliable means of managing all standard tasks, including software updates.

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Reduced Start-up Costs

Our typical user gets started in less than half the time and uses fewer resources because we do all the hard work.

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Reduced On-going Costs

The reliability of our software reduces the time and expertise required to manage the system and any associated upgrades and integrations, making it a more cost-effective solution than proprietary software.



Guardian Digital software is easily configured to support a small office with limited resources or one with thousands of users. Built on industry standards, EnGarde can be easily adapted to best serve your email system.

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100% Open Source Software

EnGarde is built using the open-source development model, combined with the security and internet expertise of Guardian Digital engineers.

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Engineered Security

Built with security integrated into its design rather than bolted on afterwards, or “patched on” in pieces, EnGarde is engineered with email security as its primary concern.

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Global Presence

Our security solutions have spanned the globe — we’ve worked with enterprises here in the United States and abroad.

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Guardian Digital Expertise

We’ve developed a revolutionary approach to standard internet connectivity solutions, and now we’re taking that knowledge and focusing on email security solutions for businesses like yours.

Let Guardian Digital help you accomplish your strategic business goals by safeguarding your most valuable assets — your employees — and your business information.